Followup:
As I said I was going to much earlier in the thread, I took mine back as soon as my hand was out of a cast.
Before I did, I carefully benched the chassis in my shop and gave it a good looking over.
There were too many things I didn't really trust and too many screwy things I found odd and off-putting about the design and execution, most of which people have already gone into here, plus some new ones I found. I think being unable to tell sharp from flat from more than a foot or two away with the tuner LEDs was the final straw. The visual and physical ergonomics didn't work for me.
If I had different needs, I might have found a place for this, but I have better, more flexible and more portable amps I can use. I couldn't see having a 500W practice amp at home, which is what this would have been had I kept it. I could see it being a good semi-permanent-setup, small-stage rig for a church player or a rehearsal room amp with a loud band, but that's not for me.
If the BG500 works out for you and your needs, great, and I wish you the best of luck with it.