I have one, I'm not sorry I spent the money, but that said, when the Crimson Trace sight comes out I'll buy it.
The lasermax works well, but forget it fitting into a holster for carry. I fired my full size a good bit in bright sunlight ,not using the sight to see if it would fall off( I had read of that happening) It never came off in my case. I understood you could, once sighted in at the distance of your choice, remove it and then reinstall without having to readjust.
That hasn't been my experience. Plus my full sized M&P40 paints the lens with gunpowder after some rounds are fired. (Wally world white box value pack target, taps, Ranger) I could be wrong but I would expect a guide rod laser to have the same issue if they made one for the M&P. Even so, I'm not sorry the lasermax is in my bag, it will fit on anything with a rail and it will find a home for good on something, just not a gun I'll carry at times. Now if I could just get a rail put on my shorty double barrel shotgun the wife would have the perfect home defense weapon
Bob