I received my L1 from Surefire (ordered it directly from SF).
It has been running for 20 minutes on high, no problems.
It has a white dot on it. Not sure if that means anything.
Oh, here are a couple of quick beamshots.
This is my L1 running a Surefire 123 battery. It's been running for about 15 minutes at this point.
This is my DEXlight X.1 running on a fairly fresh 14400.
Both images are about 2-3ft from wall. If you back away, the DEX actually starts appearing brighter as it has more spill and the L1 is more of a "cone".
One last "almost crapped my pants" note. Ultrafire RCR123's are very snug. Quite snug, in fact. OK, I almost couldn't get the damn thing out. I need to get some AW's...
BUT, when I did have it in, I only turned it on for a bit. I was going to do some beamshots for comparison, but I don't want to get the battery stuck. For the moment I had it in, I did think the high beam was brighter... but it could have been my wishful thinking.
Anyway, it's going on 30 minutes now, no flickering or anything. I'm pretty happy with this light. The color temperature is nice.