This was one of my first EDC (V3U XP-G5 version) choices utilizing a CR123/16340 battery when I first started buying lights. Sadly, it is one of the worst lights I have owned due primarily to poor build quality and beam pattern. PROS: Great UI w/forward clicky and four well spaced levels and NO disco modes, and nice small size for a 1 X CR123 EDC, and comes w/cool diffuser and tweezers for removing switch bezel. CONS: Ringy beam w/off-center hotspot, O-rings break with almost every battery swap, light literally changes modes if it's slightly jostled while on due to weak springs, switch is so overly recessed its hard to activate with a normal size adult thumb. IMO it was probably a decent light choice 6/7 years ago, but today is severely outclassed by an array of better choices.