I have 2 ultra stingers. I love the lights, but have had to send them in for repairs 3 times now within 6 months. Not sure what the problem is, I have not dropped them, got them wet or anything like that. They are great about fixing them at no charge, but that does not help when I need them. I here SureFire tacticle lights are great lights.
I wonder what they are finding wrong with those, mine have been very reliable. I have 3 ultra stingers and keep a spare battery and several spare bulbs on hand.