People seem to forget that the most common THD spec for amps is 1% (-40dB), which is what John Atkinson still uses to determine amp wattage. Next common is 0.1% (-60dB), which is about what this achieves. AVRs usually get a hair more brave and tout 0.08% (-62dB), of which I have no idea why they do this.
With the music sources and speakers typically used with this amp, I have no doubt the vast majority of customers of this product don’t hear any issues with respect to noise/distortion. I don’t like the speaker connection, but for <$200 to get AirPlay, Spotify Connect, Bluetooth, DLNA/UPNP, and use their app for (Amazon Music, Tidal, iHeartRadio, etc.), it seems like an awesome little package. Their app also seems to allow multi-device streaming. The 50W 4ohm rating however will mean home theater enthusiasts maybe shouldn’t consider it [EDIT: Looks more like 30W 4ohm actual performance].
On another note, they have a preamp with (besides other things) AirPlay and optical out, does anyone know of other ~$200 options? I see purchase help requests decently often where they want this (setup where they want to keep their amp/DAC and just add AirPlay support).