Received my BOG Q5 drop-in today as well...AWESOME output, and a very nice tint! It's a shame you can't use 18650's/17670's with this and still get fully regulated output. Oh well, as far as I'm concerned it's no biggie. The run-time on RCR123's should be pretty respectable, and the output simply speaks for itself...Thanx, Flavio!
PJD