He always told me that if some of the products that came after his hit the market had been in place, he would not have made amps. He just wanted a good sounding amp and to provide that for other people.
My favorite is still the Supermacro III and the Micro. The Mini was his favorite and was the first to use the famed high output opamp (I can't think of the number right now but very well known).
I remember now, it was the 8397. That is what Xin used in the Supermini and the Supermini was always his first love for an amp. If I ever get back up to Oregon I will look Xin up, most likely just drop in on him as he doesn't answer the phone. Too bad, good memories from back in 2005 and 2006. I still have all my Xin amps, a few Reference amps, that sound excellent, and others.