I purchased the LaserLyte add on with the purchase of the gun. It is unobtrusive and fairly accurate out of the box. It will need some minor adjusting for accuracy. I've only put approximately 50 rounds through the gun over two occasions. On the second occasion, when I had finished I noticed that the battery cover was open, held on by one screw and 3/4 batteries had been shaken out by the firing and recoil. Found the screw but not the batteries (this was outside). No biggie but just make sure the battery cover screws are secure.
Pros: Unobtrusive, relatively inexpensive.
Cons: Battery cover came off during target shooting.
This review was written in the old system and had content requirements that are different than reviews written today.