When I got my second 92FS, it had one already installed. I asked the guy if he had the original guide rod, but no luck. I was worried about it breaking or something, but after looking this guide rod over, I left it in, and have been happy with how it works as a guide rod. I wouldnt worry about it breaking and stopping the gun. I took it out the first time in mid day sun, and couldnt stay very long, and then forgot to turn it off. The next time I took it out, the batteries were dead, and I havent replaced them yet. I will say that the laser looked close to the sights in the house.
The only other laser that I have used was on a buddys PF9, and it was Crimson Trace. It was way out of adjustment, and when I was trying to use the iron sights, it was distracting me. Had to change my grip to not activate it to get inside the 8 ring from 10 yards.