I think the lasers add an unneeded element to an otherwise fine firearm. Some holster designs need to be modified to fit the grip versions (not all), and they change the grip's feel. Not to mention too many people get used to looking for the dot instead of lining up the sights which IMO is a bad thing.
The best one though if I were to use one is the one crimson trace. Unfortunately they do not make one for a bobtailed 1911 frame. I have tried them on Glocks but didn't like the feel, having felt a Kimber Crimson Carry I must say it doesn't seem bad at all. I probably wouldn't buy it or rely on it though.