I have a Supermacro 3 and a 4. They are good amps, but as has been said, he is not the only game in town anymore. I have a RSA Predator, which I think sounds better. I'm holding onto the Xin amps for nostalgia sake. I think what happend to Xin, is the same thing that happened to the other guy at Singlepower, too much work, unable to finish jobs, so just ran from it. I think Xin is still around, just not selling amps, answering emails, filling orders etc.