I lucked into buying a pair, and part of the deal was my G10s. The CF have a non-metallic feel to them, they just don't feel cold or warm like metal or G10 does when you touch it. Cool, and a great cherry on top.
But they probably work just as well as the polymer grips on my Glocks... what the pistol really needs is checkering on the front and backstraps, but I don't really want to have to do without it long enough to get that done. Having a choice of the Glock or the R9 in pocket is very comforting, given the prayer that the choice will remain moot.