David is an awesome guy. He helped me with my FS customs and I met the man at NAMM too! With the 30day money back guarantee you don't have much to lose except a couple of bucks on shipping. I came from using armatures and will stay away from armatures now because it just cannot reproduce bass frequencies as naturally and the way i like it. I have the Atrios too and i can tell you the customs sound very similar to the atrios except for interchangeable air vents (for more or less bass) and much better isolation.