I love it, and the UI is perfect for it's intended use - as a helmet mountable light for fire fighters and other rescue personnel. When you're on scene, you don't care about momentary illumination - you just want to pick your mode (usually high, so just one click will do it) and get down to business. If you're using the light as a hand-held to do vehicle checks, patient evaluation, or just for general scene illumination (aka don't wheel the stretcher that way, it's muddy/rocky/full of dog mess/whatever), you can afford to take the time to tap once/twice before you click. I think this may replace my 2 level E2L on my duty nights.
Oh, and it's very nice to see Surefire making intrinsically safe lights... for too long, Pelican has really been the only game in town for firefighters.
