Got the light today, so far I like it. Still not dark out to go play yet...
Neither of the latch bars that came with it would fit my rail well; one didn't fit, the other did but very tightly and it wouldn't come off once I had it on. The bar was a bit to tall, so I grinded it down a bit and polished it, now it works perfectly. It comes off easy and goes on easy while still being fairly tight to the rail (no rattling whatsoever).
I'll post a pic of it mounted when I get the chance, and hopefully get some comparative beam shots with it and my Gerber RX-700 (slightly modded to fit a cree r2 drop in) and do reviews of both the lights.
Also, my 3.7v CR123's fit perfectly. The light runs fine with them.