Talked to Harold at Spitfire(Headers)

OK, i have a question that I haven't seen yet (maybe I missed it). Out of the folks that have actually received the headers and installed them on their cars, how do they work!?!? Do they actually fit? do you notice a gain in performance? I don't know anything about this Harold person except what i read on the net and I have yet to see anything from an actual user saying whether the product works or not. Being they are short that should fix the low clearance problem of the non TTI/Dougs headers on the market. If they indeed do work I would like a pair to replace the iron manifolds on my Duster. I know, I know, COD!!!! (thanks Joe).