I like mine. I don't plan to part with it any time soon. Initially, I expected too much of it. I wanted it to be brighter, whiter, and with a flawless beam. Well, it's still the brightest LED I own, but it doesn't compare to a 20 watt incandescent light. Mine tends to the "warm" side of tints. Typically, I think people are more impressed by colder tints, but I'm finding this one is easier on the eyes. And, the beam in mine has a very slight donut. It's not worth sending it back, but it isn't perfect either.
I think someone above said the U2 is good at many things, but isn't really perfect at any one. I'd probably agree. Regardless, it's still a very good light, and I don't hesitate to reach for mine.