I have the GL2, GL3, GL4. I purchased clickie caps for all of them as well as having LED tail switches. I carry the GL4R on duty as my primary duty light on my belt. They are great, well made with clean machine work. very bright with a nice central hot spot that is pretty large and a wide side spill. The lights run for the advertised time and do not get very dim with the rechargeable LI-ion battery's, though because of the battery protection circuit they just go out. The batteries hold a charge very well, I have complete confidence in my GL4R as a duty light. I'll probably be getting the weapon mount shortly and using the GL3R as a shotgun mounted light on my benelli duty pump gun.
