Corsair Katar Optical Gaming Mouse Review @ OCC
 

"At MSRP, I'm a little put off by the mouse. It is solid build wise, but there is no desire to have it. I would take a crappier mouse just to have some side buttons; not just for browsing, but for gaming. It's my favorite melee button selection and damn the last couple fights in Fallout 4 trying to remember the correct key binding. Perhaps it's the game causing a little extra rage at the mouse, but really, I wouldn't consider a mouse without the side buttons after the experience with this one (and this was a nice one). Perhaps this is one to pick up on sale, but the lack of such a common feature really made this one a swing and a miss."

http://www.overclockersclub.com/revi..._gaming_mouse/