When I was in the academy, we did weapon retention for about a week, and by about the third day, I had about a 70% sucess rate disarming my partner (Glock 22 in Safariland Level III) and we found him to be particularly susceptible to rear attacks. Thugs know what gear we use, and they practice with it just like we do, NEVER get the mindset that your gear is perfect. I actually had a lot more trouble getting the guns with mounted lights out of the Safariland II's than I did the level III's, because they seem to be stiffer and they cover more of the gun. The hard construction of the level II's make you draw at a somewhat specific angle or else your not gonna get the weapon out, and we found that it was somewhat difficult to get that angle if you were not the one wearing the holster. I personally prefer the light capability to the extra retention strap.