Already the "Copper" is hell. A force to use it a lot and sabîme unsightly and unpleasant. The 3 clicks em, that of the wheel requires a overtrained finger. Seriously, you must force like crazy to click with. Then the buttons on the side are not very well placed, often they are used unintentionally, which is annoying in my case as they launch applications.
And above all! The accuracy of the mouse is poor. Play a FPS with this mouse is unthinkable.
I would recognize him still its pretty interesting setup, and its price makes this mouse still a very good plan.
Remember that I am critical optics "gaming" mouse but remains perfect for everything else.