Lousy cables. In general, this is probably characteristic of the entire modern periphery. As a result, every year and a half you have to solder a new cable. =) Cables fly suddenly and it starts with glitches and mouse reboots, which you have to react to.
The left and right mouse buttons are flimsy, as well as the plastic above them. Yes, there is such a thing. So far, no damage, but puzzles.
No indication of changing the mouse layout mode in the game, not counting the backlight. Again, a very inconvenient thing. In some complex program or toy with a bunch of functions and several mouse layouts, you can get confused if you do not constantly look at the mouse backlight mode, which is still inconvenient and distracting, perhaps. I thought that they would solve it with a software ate, through some kind of universal overlay like Overwolf, etc., but no.
When changing a game or software, the layout mode of the mouse buttons often does not switch. That is, if, for example, in one program or game you have only one layout profile involved, and the two remaining ones are empty, and in the other - all three, especially with the same backlight, then you can suddenly "hit", without the ability to change it, with the final opening mouse software and selecting the desired profile.
Few buttons. Very few buttons for some tasks. I hold the mouse with the left and constantly 3-5 additional buttons are still not enough. And layout profiles, for the above reasons, are simply inconvenient to use. Yes, for ordinary home and gaming tasks, at the level of RTSok shooters, there are still enough buttons. But as soon as you go beyond this limit of 6 programmable buttons, in addition to the three standard ones, problems immediately begin.
Price - 2500r for such a mouse is still a little expensive. Even by today's standards. The cables are frail, the backlight does not actually play a special role, there would be a normal overlay showing the application profile and layout, there are still few buttons. A DPI of 2500 is also unnecessary, because no more than 400-1000 is used in all games. The performance, again, is not at all two or three times better than that of good branded mice for 600. Unfortunately, there are simply no alternatives for left-handers.