Overclockers Club published a review on the Corsair M65 PRO RGB FPS Gaming Mouse & MM300 Extended Mouse Pad A quote from the article:

Of all of the mice I have used, this one had to be the best for accuracy, the 12,000 DPI setting along with the "Sniper" button allowed me to have the freedom of movement in battle, but tone it down to a lower DPI when I needed to line up the headshots. This is one feature I have never seen on another mouse for real-time DPI change without having to scroll through other DPI modes. This cuts down on the response time, giving you the edge. The macros really blew my mind, as well, allowing not only the mouse keys to be assigned, but keyboard keys as well. You can trigger those macros easily with a mouse button assignment, again making the response times very minimal.

 Corsair M65 PRO RGB FPS Gaming Mouse & MM300 Extended Mouse Pad Review @ OCC