Review of M6
I work at a place that sells many light designed for Law enforcement and have come across some feedback on the M6.
I personally used the M3 in Iraq for 7 months and it worked great until the last few months when it shorted here and there. (Maybe due to a lot of outdoor use). from what i've heard about the M6, it doesn't seem to keep a good BZO with the laser. meaning staying on target. again, it depends on how much use you get from it. if you are holstering it and moving it a lot, then its great as a point of aim. but i wouldn't always rely on it to be on target.
there is the TLR-2 by Streamlight that is an LED light and laser that is metal instead of plastic. which is damn near the exact thing as the M3. don't know if the laser stays true to its aim either though. best way to go with lasers is Crimson grips or something of that sort, in my opinion.