+2 for In-Yo-Grill. The deterent factor alone is worth the money, never mine what it will do for tied eyes. I cant speak for the CT on a PM9, but I put one on the kel-tec P3at and I couldnt believe the groups I was getting at 40'. That laser doubled the effective sight range. BTW, I unstitched the Desantis pocket holsetr and restiched to accomodate the CT and you cant tell the difference. Maybe the same can be done with the PM9 for pocket carry. I've been seriously considering the CT for my. PM9