For a carry revolver, go with the Crimson Trace. I have them on my 340PD.
All these guys who say lasers are a joke are your old school, traditionalists. I have no question they all can hit a fly off a target 100 yds away. But thats standing still in a range, not moving, and not tons of adrenaline pumping, and possibly multiple attackers.
But, in the dark possibly while running, both targets moving, who the hell cares how you sight your attacker?
I guarantee your groups are way tighter with the laser than without, try it with the lights down, or try it around a corner. If they help you shoot more accurately, why not use them? Most of these guys who discredit lasers are doing so because they think that by using them they are being wussies. Kinda like most harley riders think about wearing helmets. They are more against the IDEA of lasers, rather than how they work.
Notice none of them said, "oh those things dont work" ..cause they do. Of course you still need to practice trigger control, etc. My advice is, try someone elses's or go to a range that has them on one of their guns and try it out.
Yes they are easy to install and sight up. I practiced with my laser on, and off and with the laser on, no doubt my groups were alot tighter.
I am a newbie, just getting into shooting and I ask alot of advice on here. But remember shooters are extremely biased people, everyone swears by different things. My advice is use what works for you. Happy shooting!