I have a set of Crimson Trace LaserGrips on my J-frame. I love 'em. I used it in an IDPA backup gun side match we ran, and was very pleased by the ease in target acquisition and shot placement. I can use all of my existing leather too.
I also like that I can see the little red dot in low light, because it's winter time here in Alaska, meaning that low light it the predominant condition right now. I still use the sights in good light, just because of my training, but the dot is an additional tool for situations where a stable stance, isocoles grip, and clear sight picture aren't possible.
I shoot a G22 and have thought a lot about the LaserMax, but since IDPA is the place where I do most of my training (for better or for worse), I am sticking to iron sights on that one. Oh, and there's the fact that they want money for it, which I don't have.
But if I were to equip a Glock with a laser, it would definitely be the LaserMax, because CT actually mounts to the front of the guard (for $400+), which would impact my many holsters.
Luck with this, and let us know how you decide.
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Ken Johnson
Anchorage, AK