I own a donkey Stomper 8 pill with B biasing and it runs great.To drag this one up from the grave......
I've been running a Donkey Stomper 500V-HG (1x4) for close to 1.5 months now and have been very pleased with it (considering my disappointment with TS, it wouldn't take much). The readings in the video of my amp match mine, give or take 50 watts. I haven't cracked her open to look at the work because honestly, it's working great so I don't want to jinx it, but what I can see through the fan cutout looks very neatly done. Another thing I like, if I message him on facebook with a question, he responds pretty quickly. He warranties everything but the pills for 30 days from time of delivery plus he post vids of the amp in operation so you know what to expect.
He also repaired an old 2 pill I had from another builder from back in the 90's.
His quality and business practices are top notch.
I won't hesitate to buy another.