This mouse feels really good under my right hand, and just as good under my left, which considering I am predominantly right handed, is quite good. After 12 hours continuous use, I did notice my fingers getting a little cramped though. Mostly due to the large rounding in the middle, the buttons
tend to go a little low on the other side.
FULL STORY @ OVERCLOCKERS (http://www.overclockers.com.au/techstuff/r_samsung_mouse/)