I think there is also a whole lot of mindplay with these tiny amps. You look at the thing and say to yourself "I don't expect much, it can't really be much good, it's cheap chinese, it's low powered etc" and by doing that, your expectations are low to start with, so it's easy to be pleasantly surprised.
I sat there one night with a tiny t-amp based unit on top of my massive PM-95 marantz and compared over a few wines. It amazed me, but they really aren't that good at all. I've got a few now and modified a few more- they are just fun little boxes- but not hifi. I've got another SMSF comin from China to poke around with.