I love the U2, but I finally sold mine after it sat in my drawer too much. I bought it for the hurricanes when I lived in Florida, and I think it is the perfect disaster preparedness light. The 6 levels let you use the least about of battery possible, which really comes in handy if you are out of power for a week.
However, I have since moved, and the light just didn't get much use. I actually sold it and bought an E2DL. First, it fit in my pocket better, so it gets a lot more use. I use it with RCR123s, so I don't mind the shorter runtime (or lack of a mid level). I have backup batteries charged at home, and can charge them in my car if necessary. Finally, a big reason for the switch was because I had other lights that had flood, but nothing with throw - something the E2DL has in spades!
Even with my reasons, it was hard to decide whether to sell the U2 or not - it really is a great light.