I like my light, but everything NW Grateful Diver said is spot on. For signalling, a more focused lighthead is better. The clip on the battery is a plus/minus -- it was really nice for use on my original BC, where sliding a light onto the waist strap wasn't an option. But I have lost the battery on more than one occasion, and have finally done what somebody suggested to me here on Scubaboard, and put a hose clamp around the bottom of the clip.
I do love the tiny lighthead.
I have had problems with the long cord -- one rather nasty one, where the cord fouled on my inflator and I couldn't vent my BC. I've come up with two different ways to solve that, and neither one is wholly satisfactory (but either would be if you aren't diving a long hose).
My experience with customer support is excellent. My battery quit (turned out it had flooded, although I'm still confused about that) and it was shipped down to NiteRider last week, leaving our LDS on Wednesday. It was back in the mail on Tuesday, and I should get it today. I think that's pretty prompt, considering the weekend in the middle.
All in all, I'm not sorry I bought it, and it was definitely the best choice of light for the gear I had at the time. It will almost certainly not be my last light, but don't tell my husband that.