I have this mouse and it was really good for any MMORPG. I used it in WoW, and SWTOR and with so many buttons positioned for different fingers on the mouse, using it took a little bit of learning but was well worth it. MUCH better than having to use 12 or 16 buttons with just your thumb.....
Even at $100+ this mouse is above MSRP so other people must really like them. I think Steelseries should do another run, or use the same design as a generic one of their own non affiliated mice.