I present positives/negatives and you decide::

+ Incredible battery, as with all Anker products! You forget to charge them!! And they charge quickly.
+ Very light. They don’t cause fatigue even with prolonged use.
+ As long as you find the right tip for your ear (always use one size up), they never fall out. I used tips from other IEM earphones.
+ Very good build quality.
+ Small size of buds and case.
+ They play music fantastically even from a phone without LDAC, e.g. Samsung A52s, A54. They have resolution, air, bass! Honestly, I don’t notice any audible losses, even though Bluetooth as a standard is lossy!!
+ Good app. Definitely do the personal adjustment based on your hearing (HearID). In my opinion, the best setting for calls and music.
- Latency in the operation of the buds. In calls and music.
- Average ANC. On the train, only with metal music do I not hear the people next to me...
- My callers complain that they hear more environmental noise than me. Maybe the microphones are to blame? Obviously not for talkative types...
- Fierce competition at this price.

Overall, quality earphones but the average ANC and call quality do them injustice.

Update 9/25: I got a phone with LDAC (Samsung A56), paired it and a new world opened up to my ears!
In calls, the sound quality (how I hear/how they hear me) is a notch better, but the real revolution is in music playback. Huge difference!
Accuracy, resolution, transparency, tangible instruments. The lows are tight and solid, the highs and vocals airy and vivid, the cymbals sound as they should.
As for the stereo image, it’s three-dimensional and satisfying with nice instrument placement.
From classical to metal, it’s pure enjoyment! It’s not an exaggeration to say it changed my commutes and made them less boring! And considering what someone wrote in their review that they approach the level of the Sony WF-1000XM5 (€200) in ANC and music playback, maybe we’re talking about a bargain, and I should return the star I deducted from my review, but it must be objective and help the average user.
In the end, honest earbuds with some drawbacks. I recommend them.

At 1.5 years, the left bud, although it appears charged, fully discharges within 5 minutes of use, making it impossible to use. Software update, attempts to charge each bud separately and independently, cleaning, searching forums (where it was found that this particular problem troubles many without resolution except replacement) led me to leave them gathering dust. Yes, they have excellent sound, are comfortable and relaxing for many hours of use for music and movies, connect quickly, but all these are reasonably expected at the 80-something euros they were purchased for in 2023. Their lifespan, on the other hand, unfortunately classifies them as not recommended. Shame (and unfair?).

Update: In the end, I too had to use the warranty and return the product for inspection and repair. They were eventually replaced immediately with a new set. This is the guarantee of buying through Skroutz, which always provides reliability in such cases. I will add two more stars, just for the customer service of the Skroutz platform.

The headphones with the app have very good quality overall. Full highs, satisfactory bass. They do not color the sound like other cheap headphones.

However, they have some significant issues:
1. The noise canceling in very noisy environments, for example, if someone wears them inside a motorcycle helmet, the strong wind and noise cause the function to lag and ruin the sound. It cannot react properly and lags the music completely, plus it does not cut off, making it practically useless.
2. The earplugs included do not fit all ears. You need to have your own or at least invest in other foam ones so that they fit perfectly and do not come out.
3. Because they have a strange fit, not just resting and pushing like classic ones but screw-in, they often come out. Also, because of this, they do not completely seal the ear, so you lose sound isolation and bass.

Overall, they are good. The sound quality and battery are definitely impressive, but for those who want them for noise protection inside a motorcycle helmet, etc., do not buy them. In normal conditions, they are ideal

Coming from Sony's WF-1000XM4 headphones, which at the time I bought them were advertised for their top position in Noise Cancelling, I have the following observations:
1) The difference between these headphones and Sony's (in terms of Noise Cancelling) is not huge; I would say it's barely noticeable to minimally perceptible.
2) The battery in the headphones (not the case) of the Sony disappointed me, because after a year their lifespan dropped (a logical phenomenon) from 6 hours to a maximum of one hour (excessive to the point of being defective), resulting in the need for replacement. However, the soundcore so far, even though I've had them for a year and something, does not show significant reduction in their lifespan (from 6 hours they have gone to 5).
3) Durable !!!!! They have endured several drops and yet they haven't broken or degraded in sound quality.
4) In terms of size and design, they are more discreet and smaller than those of Sony (case and earbuds).
5) Unfortunately, they do not surpass the sound quality that Sony had, but we are talking about a small to moderate deviation that for me did not play a significant role.

Overall, it is a fair choice. For daily use, they are excellent, and with the app that soundcore has, you can adjust quite a few things in their headphones.

I've had them for about 8 months, so it's a good time for a mini review. Overall, I give them a 4, but it could be a 5. And I will explain.
Sound quality 5 (rich frequencies and strong volume)
Application soundcore 5 (Very effective noise cancellation to block out surrounding sounds, EQ customization based on the user's hearing ability, customization of buttons and commands)
Bluetooth and Connectivity 5 (Good range and impressive that someone can have it connected to the laptop and when their phone rings, it automatically connects to it and they can talk on the call)
Microphone 3.5 (During calls, they usually hear me, but if you don't speak very loudly or if there's a lot of noise around, the other person struggles. Definitely better than some others in a similar price range and by no means bad)
Stability 4 (I would like them to have a slightly better grip in the ear. They have fallen off a few times, and once into a small puddle of water. Fortunately, they held up.
For this price, I consider them a no-brainer and definitely one or two clicks above the competition.

The headphones were purchased during one of the frequent promotions on the official soundcore site for 50 euros. Previously, I had the liberty 4 nc, which had clearly superior sound out of the box, but due to a poor fit, I had to give them away.

The benchmark earbuds for me (in this price category) are the pixel buds a series, which have the smallest footprint in the ear, are the least tiring, have excellent separation and highlight treble mid-bass out of the box, but lose out on the lack of NFC and have now lost quite a bit of battery, and there is a hissing sound when they are on standby.

The A40s were disappointingly flat on first listen, but they had acceptable sound, good NFC, if you find the tip that fits you, they don't bother at all and are sleek, with a small footprint in the ear. Great battery life with a small case. Range is excellent, I would say, no interruptions, instant connection with phone - computer, clear microphone.

If you want to noticeably improve their generic flat sound, download the soundcore app on your phone, activate noise cancelling, and go to sound effects where you create the custom EQ with the following values: 5, 6, -1, 2, 5, 4, 3, 3, 5.

With the above setting, you will have clearer and more detailed treble, deep bass that doesn't get muddy, and mids with natural, warm, and clear voices.

If you want to activate the best possible sound, go to the settings of the soundcore app (gear icon at the top right), select sound mode and click on preferred sound quality LDAC. LDAC is definitely better than AAC, but the difference is noticeable in lossless files and may significantly drain the battery of the headphones. If you notice a difference in consumption without a distinct difference in the sound of what you are listening to, switch it back to the previous setting.

Testing songs: Hotel California for the old-timers
Tron Legacy Soundtrack for the (relatively) young
Bonus Track: Angel by Massive Attack

Enjoy!

Influenced by the comments, I decided to buy them instead of some others that claimed to have 11 hours of battery life. The battery after 5 hours of operation is at 50% with all features turned off, so it probably reaches the 10 hours as they state, the case charges the earbuds multiple times and quickly. The case seemed a bit large to me, oval-shaped and somewhat slippery. Don't expect the battery to last 10 hours with the features activated. Neither this nor any will do it, so we have to choose, the features or the battery. Also, it's mono, meaning you can listen with just one earbud and then switch to the other, thus doubling the hours, and I connect it to both my phones and my computer, without needing to turn off the Bluetooth on one phone to use it on the other, I just grab whichever phone I want, open it, and they play. For testing, I played a video on the computer and then pressed on the phone to see what would happen, so when the video finished on the computer, it continued playing on the phone. The sound is good. I didn't like the equalizer and you have to register. There is no chat feature (small downside, sometimes this feature can be annoying). They fit well in the ear, they don't fall out, and they have quite a good range. Do I recommend them? I think so, for their price they are good and of course, it depends on what each person wants from these devices. Unfortunately, maybe only very expensive headphones offer all the features, but I wouldn't spend 300 euros to buy them, I prefer to get a good phone with that money. The problem is that on one of my phones (a bit old) they disconnect regularly, sometimes the right one, sometimes the left, or even both (xiaomi redmi note 8 pro), on the other devices I didn't see a similar problem. If they will be good in the future, I don't know yet, time will tell. If I have any updates, I will return.