I have been using it as a mono audio amp for the around 10 hours now whilst sat at my desk/bench/PC and it sounds OK to me, I like a bit of bass boost so have around 1dB at 67 Hz.
To be honest I am not into hi-fi. I would not know a expensive amp to an Amstrad by listening to it, go past 8KHz and I loose it, I had to be pushing full output at 12KHz to hear a faint hiss in the ears.
To such an extent is my hi-fi use is I use my Linux PC to play mp3 files so think the weakest link for me after my ears is the inbuilt sound card and software equalizer.
So I doubt I would ever spend lots of dosh on a system
Adrian