I nearly bought one when Singlepower first started business. Glad I didn't. The first indications of poor build quality started with these amps. People opened them up and saw a ridiculous pile of spaghetti that was the circuit. Then they stopped doing PTP and went to PCBs for a while, if I remember right. Then back to PTP? I could be wrong about that.
The fact is, though, that it sounded pretty good. Unfortunately, it was also potentially lethal.