I guess I'll put in a belated report on my ARC LS second. I ordered it on the 5th, and received it on the 7th. I was (and am) very pleased with it, particularly at the $50 price. Heck, I'd be very pleased at a $80 price. This was a good deal.
It's a lot brighter than my old v.9 unit, the beam is perfectly centered, and very white, with just a little blue in the center. I'd say it's about twice as bright as the v.9, maybe 2/3 of the way between the v.9 LS and my LGI. There are minor tint variations between the battery pack and the head, etc., but that doesn't bother me.
The *only* significant flaw is how the 123 pack (the only I got with this unit) fits the head. It has plenty of threads, they're just a little loose. This is by far the easiest to turn LS I've ever handled (I have 2 colored LS 2nds as well as the v.9 white), actually a little too easy. Some mild concern that it might turn on or detach in the pocket, but it doesn't seem to have done so thus far. OTOH, I'm sure some people would prefer how easy it is to turn on, and there are some fairly obvious things I could do to tighten it up.
Oh, and it worked fine with 3 different 123 batteries I tried it with (two brands), something only one of my older LS manages (the amber HD, probably the most recent LS I had before this).
So far, I've had excellent results with all four LS's I've purchased -- no failures, no returns, no support calls at all. I'm looking forward to the LS2...