Both JayG and Carteach0 have reviews of Lasermax guide rods up. While I agree with both of them about the quality of the product, I'm skeptical of its utility for me on a carry gun.
I've had Lasermaxes in a couple of guns, the last one being a G23C back in... '01? '02? I gave up on the concept myself, at least for CCW, because of the need to operate an extra button to get the laser dot up and running. I'd imagine a real-life incident with my Glock would have run something like:
Oh, wait... *click* ...and on comes the laser.
Still, a useful training aid, or maybe on a housegun where one would presumably have more warning before use.