i'm very impressed with this holster. i've tried just about every combo out there; all sizes of guns in sob, iwb, owb, shoulder, ankle, pocket, etc.
it's very easy to put on and take off.
as far as concealment, you can't beat this thing. this was with my 4.5 inch barreled Five-seveN, which is a good sized handgun. it also allows a spare magazine which is really nice. i moved every which way, and there is really no way an observer can tell you have a gun there (why they would be looking there, well...).
however, there's one caveat. if you are a big guy with a gut like me AND using a big gun, you have to make sure you are wearing shorts/pants with enough room in there for when you are sitting. if you don't, it becomes a comfort issue (only while sitting). if your pants are baggy enough, this thing is very comfortable. as a bonus, it doesn't interfere with a seatbelt nor does it tear up your shirts.
it's pretty easy to draw from as well. i think strong side OWB has a slight advantage here, but only slight.