Paddle holsters are a no go in my book, due to dodgy retention. Case in point:
Handgun class at Quantico, 2005:
Student Bonehead proceeds to draw his Glock 17 from an Uncle Mike's OWB paddle holster, and much to his chagrin, the holster is still on the Glock. Admonitions and snickers are heard in the background.
Student Bonehead locks and clears handgun, walks over to trash bin, throws said Uncle Mike's holster in the garbage on the spot.
Student Bonehead employed a BT OWB belt holster for the remainder of the class.
Student Bonehead was yours truly.