bought from RSA directly. Ray is really nice and super helpful on the phone. I own 3 of his amps and he as let me use whatever I want as the serial # as long as it hasn't been taken - favorite athlete's jersey number, my initials, my favorite number...   The Shadow is RIDICULOUSLY small (width/depth size of a movie ticket stub) - I still can't believe it every time I take it out. I bought one of Ray's Mil Spec LOD's (good price, great product) and can use any iPod with the Shadow. It sounds so good - I think with IEMs, even though you can power...