Maybe a bit late. I just got my SMSL AO100 amp, and didn't have any issue so far. I didn't have a device to test power amp though.
I got mine yesterday from Amazon...all good so far. I need to test with higher volume today and play with the tone control (though I will probably leave flat most of the time). I like the remote and setup was easy. Fast hooking to the internal bluetooth connection. I like that you can set the display to not be on all of the time. Very, very faint sound when you power off the amp, not a pop per se but you hear it go off. Seemed to have no problem pushing my 6 ohm KEF Q 15.2 speakers to good small to medium size room levels. Very nice ramp up on the volume with the electronic volume control. Case stays very cool to the touch.
Another plus on this is the subwoofer out, I don't own a sub but may gently dip my toe in that pond later this year. I may see if I can borrow a smaller sub from someone here in town and see whether I like it. This is initially destined for the dining room system, so may not invest in a sub for a while.
Very nice price point and overall product, so I'll retire the Aiyima A04 for now and just keep using the A07 in another system where I don't need multiple inputs at a time.