I installed this on my glock 22. It went on easily in a few minutes. Everything was included including a few extra parts. This gun is in a lockbox beside my bed. Primary use is home defense. If an intruder is in my home at night, my wife could see who it is and aim and shoot very easily. It does make the grip thicker, which is a little sad since my wife has smallish hands. This is my first laser, and I find it a little distracting because I usually aim with iron sights. It works sufficient outside at 20 yards in daylight. The light is plenty bright for in the home distances. I have not used it outside. The "free" holster is fair, it is an inside the waistband holster which is fine, but this is a pretty big gun to have in your pants! It fits the gun with light and laser installed.
Pros: Easy to install and works very well
Cons: Makes grip thicker
This review was written in the old system and had content requirements that are different than reviews written today.