I have one of these LaserMax guide rod lasers on my S&W 5906, and mine has functioned exactly as advertised. After 3 - 4 hundred rounds I see no battering or any sign of wear. I haven't had any problems with it at all and my gun still fits in my holster normally. What I like most is that it doesn't have to be adjusted since, as your new guide rod, it is already perfectly parallel to your barrel, so at 25 yds your bullets hit just a hair above where the dot is. There are a couple features I don't like - it's small size sacrifices some laser power, meaning the dot isn't as bright as the HotDot laser I had. Secondly, the way the on/off switch is located won't allow you to turn the laser on and off without taking your finger off the trigger, since the switch replaces the slide stop. I preferred the movable pressure switch on the Hot Dot I had better, but, of course, it wouldn't stay sighted in so I got rid of it. Therefore, when trouble darkens your door, unless you wanted to run around with your Lasermax on more or less permanently, you have to make a conscious effort to flick it on just before you make your shot. Another annoying quality is the ease with which the laser can be turned on (and left on!) accidentally when laying your gun on a table. So, although it's nice, if buying again, I like the versatility of the Laser Grips by Crimson Trace as they have pressure switches, which can be turned OFF when not needed.
Good Luck!
