Just want to point out the review about this unit not working in the cold... That is not a valid complaint against the gb800, but is true for green lasers in general. There is a working temp range for all green lasers, which on the cold side is limited to 30-40 degrees f. Red lasers from my experience, maintain better brightness and functionality into colder temps. Overall I think Beamshot's gb800 is great bang for buck quality and performance wise when I shopped it against a Veridian that was twice the price, but not twice the value.
This review was written in the old system and had content requirements that are different than reviews written today.