Just my two cents, but I would personally recommend against this mouse. It takes a LOT of getting used to the shape, and I found the "ring finger" rest area to be awkward instead of ergonomic. The clicking also feels...sloppy to me. It's not well defined like in every other mouse I've used - I found myself clicking when I didn't want to a LOT. Got mine for $25 and honestly still didn't think it was worth it.
I'm with jwaz - after going through several mice I laid my hands on a Zowie FK and will likely never switch again.