Whilst not a very good edc light...the M3 is my favourite Surefire (which I own)!! It, and the M3T, always seem the best of the millennium series to me.
The M4 is longer, more expensive to run and its 1-hour runtime lamp is not much brighter than the MN11/MN16 (20-mins) in the M3/T. Plus I have read that the M4 lamps are slightly overdriven.
The M6 is VERY bright and looks stunning…but it is bulkier and obviously more expensive to run /ubbthreads/images/graemlins/broke.gif.
The M2 is pretty big and heavy, compared to the other 6v systems, but is not any brighter.
The M3/M3T seems, IMHO, to be the best compromise of output, size/weight, running costs and strength (amongst the millennium series). In short……you WILL be PLEASED with you're M3!! /ubbthreads/images/graemlins/grin.gif /ubbthreads/images/graemlins/grin.gif /ubbthreads/images/graemlins/grin.gif