1. In no case do not buy without playing it in the store. According to my personal feelings, the ergonomics are simply disgusting. There is no way to hold the thumb and little finger from the sides. At first, after an hour of use, the hand begins to hurt, or even the forearm.
2. The buttons are terribly tight. After a month of use, you will definitely master the secret death blow with the index finger from Kung Fu
3. Scrape the table! Unbelievable, but true: it clings to the surface with sharp corners and does not slip evenly
4. Forget about precise scrolling. He's terrible. For web pages, nothing yet, but in the scrolls in programs, you are tormented. Either you stroke the mouse to no avail, or you scroll all the way down all the way
5. At the same time, sometimes the scroll is very responsive! For example, you hold down Ctrl and click something, such as a link. Congrats, the text on the screen is now scaled to 243% because the mouse decided you wanted to scroll. You will be aiming back for a long time (see previous paragraph)
6. For such money, it does not have a built-in battery and USB charging. I will have to buy batteries, although for a year I have not taken down the one that is included
7. The surface of the "buttons" is rubbed off, fingerprints appear. Perhaps you can wash it with something, a damp cloth does not help
8. There were positioning problems on glossy surfaces, although the blue "laser", according to promises, should work almost on a mirror. Perhaps the case is in the glass insert of the table - here I can not be objective