10 May 2014, this unit was purchased thru DVOR of Optics Planet. It is incredibly brighter than the Insight Technology M3 rail light which it replaces, not to mention the green laser which is highly visible in darkness and light, but arrived well zeroed. The only downside was that after installing the proper key (c) for a Glock it rests so far forward of the trigger guard that the switch is difficult to reach and turn on with the trigger finger. This ubnit fit better on some of my other pistols, but was purchased for a Glock 23.
Pros: Great illumination and laser visibility
Cons: hard to reach toggle on a Glock 23
This review was written in the old system and had content requirements that are different than reviews written today.