Very good and comfortable. The quality is a bit strange and the lifespan can vary dramatically depending on the batch. For example, an older one I had lasted me almost 2 years, while a second one I got only lasted me 6 months. I believe it's okay for the average user.

After a short period of time, the left button needed to be pressed twice to work...the mouse is crappy.

The mouse the first time I got it was defective and I returned it. The second time I faced a similar problem. While it works fine, after a while it stops responding properly. The connection is constantly lost and takes a long time to come back. I would not recommend it to anyone.

Comfortable, lightweight, quiet, and I was very impressed by the strong response of the powerful optical that doesn't envy the laser.
As for the drawbacks, I will mention that the color on the buttons started to fade after about 5 months.

The right and left click do not respond with the same sensitivity as they did at the beginning, I have to press harder, which is very annoying. In short, it broke on me, a big disappointment, a waste of 20 euros. I'm waiting for it to completely break so I can throw away this junk and get another one.

All of this happened within less than 3-4 months of use.

After 4 months, the left click started to not always respond and require more force. It is impossible to work with this mouse anymore.

The mouse is simply awesome. Its keys are silent and respond immediately. I just wish it was a little bigger.
24 Sept.: It started peeling.

Very good mouse. Its buttons are silent and slightly sensitive to touch, it is accurate, does not disconnect, and is relatively comfortable.
The only comment I would make is that it could be slightly larger to be even more comfortable to hold.
*** November 2018. The mouse wheel gave up (it simply rotates without any resistance but there is no response, which may mean that something internally has moved, but I didn't bother to investigate). After about two years of daily, almost uninterrupted, and not always careful use of the mouse (e.g. drops). I would deduct one star because it turned out to be not as durable as I thought, but no other mouse in the 15-20 euro range has lasted me 2 years, so I will leave it at 5 stars due to its low price

After a few weeks of use, it is one of the best mice I have ever held in my hands. The buttons have a quality feel, the movement is precise, the grip is ergonomic, and overall it seems like a very high-quality mouse. I don't know how long the battery will last because I forget to turn it off, but time will tell. An awesome mouse overall, at an awesome price as well.

After several mice that I had bought, this one is very good, perfect and in hand application. I would recommend it.