Crimson trace laser grips are great - Crimson Trace Lasergrips for Ruger P Series Pistols LG389

These are great for low light use when your pistol sights are difficult to see. I installed these in less than a half hour. I am confident in their use.
Pros: Easy to install, easy to operate
Cons: Laser dot hard to see in bright sunlight

This review was written in the old system and had content requirements that are different than reviews written today.