That is a hard question to answer, because what is "worth it" to one person may not be to another. And people's circumstances vary.
Like cars, guns, knives, computers, photgraphic equipment, stereo equipment, watches, women's jewelry, and all kinds of other stuff - small increases in quality above a certain point cost increasingly larger amounts of money.
Is the U2 nice? Yes. Can you get something else almost as nice for significantly less money? Yes, I think so. Do I use my U2 most of the time, or even a lot of the time? No, I don't. Knowing what I know now, would I buy it again? Sure.
But I'll add this - most of "high-end" lights out there are pretty hard to justify on purely economic grounds. The same thing is true of all the things I listed above, too. So, if your view of this is that it is mostly a "bang for the buck" discussion, you might want to look at something else instead of a U2, get a light that is almost as nice, but a lot less $$, and keep a chunk of that money in your pocket.