I don't like it because:
1. Sight protrudes and can easily get caught on clothing;
2. It's not close enough to the barrel
3. Why have an external "bolt-on" laser sight when your guide rod can be your laser sight?
I'm not all that interested in laser sights. Since I'm not a combat professional, if I am ever faced with a "combat" or HD situation, I need my firearm to be fairly simple to opperate. I don't want more buttons and doo-dads to fool with. But, if I were going to have a laser, it would be a Lasermax internal laser for my Glock.