A lot of people haven't really listened to many amps on good speakers.
Well, I've made it my mission to. On a good quality speaker, listening to these is pretty bad indeed.
Of course, this is unfair. It's a cheap amp that you can use to do a job. In that respect, it's fantastic. It's just if you are expecting comparison to something with some actual sonics (crest, lab gruppen td stuff, MC2 stuff) you will be severely disappointed.
So dear reader, buy away. I've installed about 5 of them in background music type scenarios, and I'll keep doing so, because the density and value is incredible. But using to these on anything decent, completely forget about it.
And yes, I can blind A/B the difference. And no, it's not that I'm missing a distortion elsewhere, it's that the topology implemented in this manner sounds really bad.