My S&W 617 (K frame) came with a set of these from the factory and I loved 'em. They're durable, comfortable, don't create any hot spots during long firing sessions, and are cut to work with speedloaders. Also, they're designed so the backstrap of the grip is exposed so these provide a short trigger reach compared to other rubber grips I've seen. My S&W 686P (L-frame) did not come with these from the factory so I'm picking up a set to replace the subpar OEM rubber grips. And these are cheap to boot!
Pros: Comfortable, durable, looks and works great!
Cons: None
This review was written in the old system and had content requirements that are different than reviews written today.