Before that, there was a Zalman GM-3M, well, a normal mouse like a mouse, nothing special, the main thing is that the side buttons worked simultaneously with the LMB, but the side buttons conflicted together. For example, if you assign CTRL + ALT to the sides, then only one button works. In Corsair, all buttons are independent, which is very pleasing. In general, of all the mice that I have had, this one is the best. And I had JET-A JA-GH23 / 26, Chinese slag, I got A4 with my scroll. This mouse should have 5 stars relative to other manufacturers in this price range, I don't know why, but many of the build quality and materials have deteriorated dramatically. The same Logitec is only worth reading reviews, A4 is an eternal problem with mechanical scrolling, and in general they donβt live long.