The quality of production is traditionally not satisfactory. Everything is complicated with ergonomics: on the one hand, there are a lot of buttons that, due to the bevel, do not get confused with each other. On the other hand, the row (or even two) of buttons closest to the hand is very inconvenient to press (even despite my not the longest fingers). The third big button (to the right of the traditional RMB) is offered by default as a modifier for the side buttons, but it's almost impossible to press simultaneously with them without shifting the cursor. Three profiles can be stored in memory, in principle, this is enough. Software (Logitech Gaming Software) in my opinion is not very convenient, many functions are available only when using a local (saved on a PC) profile.