I have it since September 2021, about 2.5 years
I use it for cleaning 2 vineyards totaling 1.8 acres three times a year. One at the end of November (cleaning dry high weeds/grasses 1.5 meters high), one before pruning at the end of February (in green grass about 30 centimeters) and one at the beginning of summer with whatever grass has sprouted.
I use a 4mm nylon line Nakayama carbon twisted on a 4-way aluminum head.
For this specific job, the machine is flawless.
Below I give the pros and cons
Pros
1. It always starts immediately.
2. For the money it costs, it is very powerful. I have used a brand costing 300+ € in the past, and the Nakayama is much more powerful.
3. In terms of vibrations, it is quite good.
4. Impeccable attachment.
5. Quite reliable.
6. Genuine spare parts are available.
7. The fuel tank guard is metallic and quite sturdy. Nevertheless, it broke and I replaced it.
8. A very effective cutting disc is included in the price.
9. There is the possibility of adapting a small tiller for about 100 €.

Cons
1. Weight. At least 1.5 kg more than equivalent brands. Fortunately, the attachment helps.
2. Consumption. With hard use, it calculates 1.2 liters in one hour of operation with many revolutions.
3. The controls are decent but with a poor feel. No comparison to the brand names.
4. If you push it too hard, it can't handle it. When used with the disc and cutting wild pear trees, apple trees, or the bell that connects the engine to the rod, it broke at the anti-vibration rubber and the machine became useless. I ordered a new bell, changed it myself, and everything was fine with 45 €.
5. It is good to stop it for a while every 45-60 minutes, anyway you will need to refuel it.

Overall, I am satisfied. It does what it promises

In the mornings, I mow grass in the Municipality with Stihl FS560c and when I tried the Nakayama, it felt like holding a Playmobil. The price difference between them is over 1000€ and for serious reasons!!!
However, I could spend less than 200€ for household use and it is definitely worth the money!
It gives you the feeling of a good Chinese product.

Positive points:
1. Comes with a good attachment, no need to buy another one
2. Anti-vibration handle
3. 2-year warranty
4. Under the fuel tank, it has blades so when we leave it down, we don't risk breaking it

Because I do this job professionally, let me tell you that:
1. It does NOT plow, it does NOT harvest, it is NOT all-powerful. It simply cuts grass decently.
2. It is not for making a living! It is for household use, maybe a little more for cutting grass in the countryside. If someone wants a machine to make a living, I recommend Husqvarna 553RS for 600€ and above.
3. Use branded oil in the ratio recommended by the manufacturer 25:1
4. Do not put 4 pieces of nylon cord in the head. It can't handle it! Put only two. For thick grass (weeds, etc.), use a 3mm nylon cord or the blade. For home use with grass up to the knee, use a 2mm nylon cord. Of course, it is better to use a different head!
5. Take a longer break than calculated and I believe it will last.

Negative points:
1. High fuel consumption

Update (almost 2 years later):
I used it quite a bit using the cutting blade. I lost 2 screws from the handle and replaced them. The blades under the fuel tank broke and I improvised + glued the tank in one spot with special glue. I maintain it with grease, air filter, spark plug, etc. I clean it after almost every use. So far, EVERYTHING IS GOOD! I recommend it...