It is a cool light. It took some getting used to the UI, I'm never quite sure if I'm in high or Turbo for example. On the plus side, both high and turbo are pretty damn bright.
I have been loving mine since the day I got it. It now resides on my duty belt right next to my XT-11. Having something this small with the ability to put out massive amounts of light has earned it my respect without any doubt. I also agree about the U.I.. It takes a little getting used to but the effort is well worth it and doesn't take to long to adapt to.