HS tested this mouse with 15 programmable buttons for RPGs and strategy games. Check it out.

Here is a snippet: "After testing most of the products within the Vengeance brand from Corsair, we finally put our hands on the M90 mouse. So far, we've tested the combo mouse/keyboard for FPS games, the M60 and K60, and the K90 keyboard for RPGs and strategy games. The M90 mouse is a perfect match for the K90 keyboard. Featuring 15 programmable buttons, the peripheral reaches 5,700 dpi of resolution. The user can create six profiles stored in the internal memory and 50 profiles that can be saved in the PC. Let's take a look at its physical characteristics and then test the mouse."



Link: Hardwaresecrets