Sounds just fine! And one other benefit of these amps are the line outs, which I believe companies like Niles and Sonance routinely put on their amps for daisy-chaining. Instant sub out! For old 2.1-channel enthusiasts like me, that's a big plus, because a lot of the older preamps and power amplifiers often have no easy way to hook up a sub. (I have a late '80s PS Audio Source preamp as a backup, which allows me to use one set of passive outputs in addition to the regular buffered outputs, but I prefer my outputs to both pass the same strength signal.)
I’ve used the loop outputs for lots of things, testing other speakers off another amp, running A/B comparisons and such.