Been lurking for a bit around here, nice counterpoint to the crap over at HF.
I have a Xin SuperMacro 1 from late 2005. Ordered it and had it in a week, I would not send it back for upgrades if it took longer than a week. I have heard the SM 3 and it didn't sound any better than the one I had, just different. It had more full lower end bass and a bit more round on the highs. Whereas my SM 1 is more analytical and flat. The practice of no contact for 10 months is horrible and shows that he doesn't care whether they buy the amps or not since he has a long backlog of willing lemmings.
I like the SM, there are some design issues I don't like. Mostly involved with the 8 AAA battery layout and it being very fickle about actually lining them up and powering on. also had an issue that I had to pull the boards out and file down some of the protruding resistor wires that grounded against the case. But it's a DIY thing I guess.
Makes me want to get a Pico and compare