I don't really care about the weight, what caught my attention was they offer ceramic? coated magnesium scrollwheels. My otherwise mild skin condition completely destroys the shitty grippy/gummy rubber they put on scrollwheels and sometimes the sides of the mice. They offer the same coating on the shells, which I really enjoy.
Yes, it's expensive but it still costs less than replacing mice over and over. I spend too much time holding this damn thing to settle for anything less. The quality is exceptional, assembly was easy, and the carbon fiber rod that snaps into place horizontally across the shape makes it more rigid than the stock mouse.