I saw a couple of these yesterday at the Amelia Isaland car show. To my taste the cars have a "getto" look about them. It may be that I think that the wheels are way oversized, whatever, I would not pay the bucks for one.
I'm not an S550 fan in general, there are some cool aspects of these.... But over all they look over done. The Mustang tuner market is a crowded place. Not sure where these fit in.