My girlfriend has one, got it because remote control and all the nice inputs + subwoofer output. It powered here Magnepan MMG-W before we moved in together. At the time, I thought the mediocre-but-fun sound was a result of the speakers and/or location.
Now that we live together, I’ve had a chance to use it in other systems, and it sounds noticeably bad, I do not recommend it at all if you care about fidelity. It’s the worst-sounding amp at the house. Even though it has far less power, I’m using the Dayton DTA-1 for the bedroom instead of the Fosi because it sounds so much more clear.
sorry… I wanted to like it.