Good article about Crimson Trace Corporation (CTC) laser grips on J and K frame S&Ws in the latest "Combat Handguns" magazine.
Most shooters I know don't understand what a great addition to a pocket pistol the CTCs are. I install them on all guns I carry.
Nothing like a quarter sized group at 50' from the hip to make a believer out of you.
And if you shop around you can find CTCs discounted.