It's true, they are pretty heavy. My 640 nd with vz's weighs 24.75 oz ( loaded ). My 640 nd with magnas and Tyler t weighs 23.25 (loaded, same ammo), so they are 1.5 oz heavier. Might make a difference on an airweight, but on my stainless guns, it's fine. The airweight wears hogue bantams, and is 16.75 oz (loaded, same 125 gr gdhp).
The VZ's have a nice subtle texture that is grippier than wood, but less tacky than the hogue rubber, and the texture doesn't chafe my skin like either. The G10 stuff seems really durable. Time will tell.