the HK$ one is too complicated and expensive in my opinion. most guys around here have the greddy, which i should have gotten insted of my RFL. anyways, just my opinion. i'm done now.
eh, the RFL is really nice, and it's certinly a quality BOV. i've head the greddy and i think it sounds a lot cooler. although, it's a lot of fun to have one of the loudest blow off valves out there for scaring unsuspecting pedestrians }>