If there were more stars, I would give them..
First of all, top quality construction, even in the packaging, the materials, rubber bands, cables, box, packaging..

I bought a double kit v4
To bring internet from the 1st floor to the ground floor..
To my surprise, I noticed that now on the entire 1st floor I get 300mbps download and 150mbps upload from the 300 of the wind line (having turned off the wifi from the router to avoid interference) (important)..

The most impressive thing is that on the ground floor it steadily delivers 300mbps wirelessly (set up as an access point)
The photo is from a measurement on the ground floor, with the phone's wifi!

Basically, the whole building has full signal!
Really very good product, with super simple installation and easy app!
Eyes closed!

Very good and reliable. It has satisfactory coverage throughout the house. I have installed the double and it covers the whole house with good speed. I have a 500mbps connection (which it actually achieves) and even in the most remote areas (with walls in between, etc.) it gives 150mbps

Incredible quality and stable signal and speed. Obviously, you need to turn off the Wi-Fi from your provider's router and connect all devices to the Decos to see a difference!

Perfect Wi-Fi 6 coverage in a three-story building. Very easy installation through the app and stable signal everywhere without any disconnections. The best upgrade for the home network!

Do not get just one. A pair is required. One at the modem-line, the second remotely. One alone does nothing more than the modem.

Epic. I have the v1 in access point mode, I have turned off the router's wifi and placed one in the living room and one in the hall. There is no spot in the house where I don't get 100 Mbps (my line). A big advantage is that you can define where each device connects, and that it lets you create a separate 2.4GHz network for cameras, printers, etc. I recommend.

After using it for a while with two different providers at 300 speed, with a system of three repeaters, and a distance of about 5m, it barely manages to transmit 100 to 130, which is unacceptable for the price considering it claims 1000 to 1800. The only good thing is that it has a stable signal, otherwise the speed is terrible!!!

So far it works perfectly. Very good connectivity without interruptions. It is small and also serves as a decorative element in the space. I will get another one to cover the whole house.

It does the job. It was installed on the Starlink, which as WiFi is weak, and it works much better, with signal throughout the house (2 units)

I've had it for a year and a bit, 24/7 with over 20 devices connected on guest (smart home, mobiles, etc. etc.), 0 disconnections, it works FLAWLESSLY!

Positive: In terms of signal it is good.
Negative: In terms of features, only the basics, and anything related to security and parental control requires a subscription from 20 to 60 euros per year. Also, when it is operating as an Access point, it does NOT have security and parental control settings.

very easy to set up and quite good speed performance (the layout of the house (rooms, walls) and the placement of the nodes (near objects vs in open space) definitely affect it).

Used in a maisonette house, 75sqm each floor. I replaced the powerline because it had problems.
Excellent!!! I put one on the lower floor next to the router which is located at the bottom left corner. The second one on the upper floor in the far right corner.
Installation was a breeze, done in 7-8 minutes. It easily covered the dead zones I had before and the signal it gives is strong.
Night and day compared to the powerline. I haven't done detailed measurements but 5 devices work simultaneously and without any issues. And it also has a good app that provides plenty of information.

I installed it in 10' and since then I haven't had to deal with it again.

With 2 deco units I have a unified wifi network, with good signal everywhere (100sqm + balcony) and good speeds.

For anyone interested, it offers many more features such as monitoring via the app, device tracking and their activity, reporting, security, parental controls, smart home/rules, vpn, etc.

At the 100 euros I paid for the 2-pack, it's 100% worth it.

Excellent, definitely worth its money!! I got the triple kit + the outdoor to cover an area of 400 sq.m. in a complex of stone houses on an island (with 60cm thick stone walls!) and they do an amazing job!! We have good internet in all 4 houses and the surrounding areas (24 Mbps line) and to think that the outdoor unit, which is the source, was installed outside the house, in the same position as the router inside - it feeds the other three decos in a chain, it's 100 meters away from the first house and as I mentioned before there are stone walls and other obstacles in between!!

A little attention, if set up as a router you lose the capabilities for Spotify/Tidal connect and you have to set it up as an access point so it doesn't give its own IPs

I wanted to extend the wifi network as I have a connection with a 5g router, which did not have satisfactory range. I had higher expectations that it would comfortably cover the house which is about 120 sqm. In some rooms, the signal is weak. Of course, the placement of the deco also plays a role, as it was affected by the difficult spot where the router is located to catch a good 5g signal. However, the range has definitely improved significantly! I will get a third one to meet my needs. The devices are sleek and fit nicely with the house. The connection and installation were a breeze with the help of the app. However, I do notice some occasional disconnections of the devices from the network. I hope that these will be resolved with some update.

Used as an Access Point connected to the provider's router.
I bought it second-hand from Skroutz for €40, which is great for that money—we upgraded a former central Main Deco E4 to the X20. And we also retired 2 other Deco E4 units for the vacation home.
It has more range, of course, the E4 is Wifi 4 and the X20 is Wifi 6, but that's okay since we don't have that many Wifi 6 devices yet. Also, the home speed is less than 100Mbps Download, so I don't take advantage of the faster Ethernet yet, since the cheaper Deco E4s have 10/100 ports while this one has 10/100/1000 Mbps. The NAS definitely runs faster.
The process of replacing the Main Deco is not the easiest and is a bit annoying, but if you try 4-5 times and have enough time, it works out.
It's not just Wifi 6 compared to 5, it's that as a newer Deco it has a better processor as a device—faster, and even Wifi 4 devices perform much better in synchronization, as do older devices.

So far so good. I got the bundle with the 2 mesh where one is next to the router and the other in a room far away. It covers the 110sqm apartment. Very satisfied so far, better speed than just having the router for far away.

Excellent router, even for use outside the mesh network. The only problem I encounter is that sometimes you have to optimize the signal through the application in order for all devices to stay connected.

I highly recommend them. I got rid of cables, powerlines, second routers, etc. Very easy installation with the application, even if you have no experience with "technology"... If you need a third one, just buy it, plug it in, and that's it, it has "seen" the rest. No issues so far. Oh, don't forget to disable the WiFi from your router, these devices will provide WiFi now!

I would not recommend it because it is unstable. The devices suddenly lose internet access next to the 1st access point that is directly connected to the modem via LAN.
Having upgraded to the latest firmware, I searched the internet. The problem has been around for at least 3 years and it seems they have not been able to solve it.

One solution I found is what someone mentioned, to reduce the connection speed of the devices...

I still need to try it.

As an access point, I would not surpass it. The mesh technology is not ready. It has bugs.
I would go for a Mikrotik access point with the same or even less money.

UPDATE:

After the latest upgrade, it works fine. It covers two floors, courtyard, and rooftop with 1 pair of devices.

Excellent wifi mesh! I had bought it for my house, which is an old one from 1960 with thick walls, and it provides stable internet everywhere with high speed. Eventually, I bought it for another house as well because it satisfied me so much. The app it has gives you the ability to limit or block access to a device connected to the network. Excellent little devices!

With two deco, one placed in the router of the ground floor apartment and the second in the upstairs apartment, it only catches satisfactory internet with a speed of 80 mbps on the top floor. Before the deco, it only reached a maximum of 30 mbps and in some rooms, 10 mbps on the top floor. I had doubts before buying it, but it does its job and more. I called the company, but they cannot assure you that it will work 100% because it depends on many parameters. I want to inform you that the apartment building is new with very good insulation, so I have no doubt that it will work in your case as well. Buy it with your eyes closed, I saved an additional connection.

Stable, I work it in a 3-story house with the central unit / line of Cosmote on the middle level, good communication with the other two units in the basement and the upper floor, relatively easy installation through mobile / app, it requires a little familiarization though until the set-up is completed, generally a good choice, I believe it's worth its money