I purchased one of the Primos vests before last season and sewed my safety harness inside to prevent harness tangling. It worked fine until I had a shot on an 8 point: when I released, one of the pull tabs on a vest zipper caught on the lower limb of the bow. The arrow flew three feet to the left and the pull tab/cord/zipper mechanism was yanked off of the vest.

I have since switch to the HSS harness/vest: less pocket storage but no dangling pull tabs to snag.