I have Crimson Trace on my 629 3 inch , m-60 2 inch ,m-19 4 inch and kimber ultra CDP.
I love them all. Very comfortable grip and bullets hit right on that little red dot. Last week I shot a 6 shot group with my 629 from the hip with the gun braced against my belly and every shot was touching and dead center on target. Actually every time I shoot that 3"629 I like it more and more. I reload and I was shooting LSWC 240 Gr at about 900 ft per sec - a most pleasing load indeed ! I also shot some 240 gr JHP`s at about 1100 ft per sec and they did just as well.
I am now a firm believer in laser grips. Too bad they don`t make them for my Python!