For what it's worth. I can not take anybody speccing their amps at 10%THD seriously, why not 100%THD, you would get even more "watts" ....
I just can not convince myself to get excited about this amp - it is cheap - cool. Better than other cheap chip amps - great. So what.
looking beyond performance at 5W and 1kHz [which is respectable] it offers very little. E.g. this graph is just plain ugly, rising distortion in multiples with every kHz added, and I fail to understand the comment "unhappy above 1kHz, but otherwise very good performance". There is actually lot of music going above 1kHz. Combine it with some average DAC, that has SINAD 120, but also shows rising distortion at higher frequencies and I think you will get into audible issue territory,
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I can see this amp being used as desktop with some smaller bookshelves speakers ans some budget DAC - and here, if you combine everything - you can get get much better value by buying some well-performing powered monitors.
Also "cheap" is very relative - 220USD is not exactly cheap, like "if I don't like, I just throw it away" and for not much more money you can get some normal HYPEX based amp.
Sometimes cheap is just not worth it.