Sometimes, you get what you pay for, as is the case with this barska laser. It's cheap to buy and cheaply made. The on/off switch is a complete turn-off, not ergonomically useful and needs to be redesigned, hence the "3" rating.
Pros: cheap to buy
Cons: cheaply made..on/off switch needs improvement
This review was written in the old system and had content requirements that are different than reviews written today.