First of all, I'm a drummer, therefore I have no real need for wireless connectivity on stage since I'm not moving from my drum throne.
I attached a piece of wide strap to the side of my drum throne with tape and I use a belt clip to keep the amp near and accessible at all times. I can reach for my volume control in less than a second!
That also makes it easy to connect the stereo inputs via 2 XLR inputs from my mixer. The only minimal "problem" I have is the ON/OFF switch is a little bit hard to reach and press underneath the DC input.
The sound is good enough powering my Shure SE215s. I would give it a 4/5 in absolute terms, it's not the absolute Hi-Fi quality, but it's good enough for pretty much everything.
The build quality is good, the amp is very sturdy and comes in a nice plastic carry case. No problems there. I also bought the Fischer Amps DC Power Supply so I didn't try it on battery power yet.
All in all, a great device, very handy and nicely built, I'm super satisfied!