A friend of mine makes a good living repairing them.
Most are bought direct, not through a dealer, and
have poor warranty terms. The same amplifiers
keep coming back with different faults.
Most are about 1 year old.
Iain
I'd imagine the one's you'd likely see on ebay are bottom feeders in
general. But couldn't be too complex and too much trouble to work on
yourself if you had to. On the other hand, go to any audio show to see
all the good stuff that's coming out of Asia, you'll be suprised at
some of the top shelf stuff and how good it sounds, but will have a
price tag to match. So if I wanted to play around with a $300-$500
bottom feeder amp off ebay, it wouldn't bother me too much. I guess
I'd be more worried about getting ripped off or amp arriving in
smashed pieces, more so than the peformance or reliability of the amp
itself for the money spent.