I looked at these yesterday and was not impressed. The laser on each needs to be activated by a switch that requires a movement distinct from the presentation grip (less so on the 380 though) which, according to the S&W rep I spoke to at the Shot Show yesterday, is because Crimson Trace owns the patent on that feature. They took was was a borderline useful (or borderline useless depending if you are a glass half full or half empty sort of person) feature on a short range personal defense weapon and rendered it silly by making it impractical to flip it on as you draw. Too bad they didn't spring for Crimson Trace or a patent license.
The cylinder latch is different (a flat piece where the exposed hammer would go that is pushed up with the thumb) and a star that mates with the cylinder rather than a hand.