I had previously been using the Logitech G500 and after years it finally died on me. I loved that mouse and all in all, this mouse is a pretty good replacement. It is missing the scroll lock/unlock feature of the Logitech G500, and this is all I miss about it.
The one thing that stopped me giving this a 5 star review, is that the mouse LEDs often turn themselves back on after the computer has been shut down, which is really annoying. Other than that, good weight, good size, a good FPS and general use mouse.