Well the little amp has come and gone. I received it last Thursday and of course put it in the system that evening and listened as long as I could. I wasn't able to get any time on Friday but had quite a bit of time on Saturday. Unfortunately it was not a good fit with my setup. I can see why a lot of folks love it but in my setup it was fatiguing. Not entirely sure why but ultimately I kept wanting to turn it down and finally just shut it off. The demo amp I had has been in use for several months, so certainly broken in.
Like all amps, it's never just the amp, it's a system. A now departed amp designer once told me he believed the biggest factor in determining how an amp sounded was how bad it misbehaved with a the reactive load of a loudspeaker vs a benign resistive load on a test bench. I didn't fully agree with him but I do believe it has a lot to do with the end result. I've no doubt that the Job is superb with many systems, too many folks like the results for it to be otherwise but with my speaker/crossover setup it wasn't a good match. I didn't have any noise or other problems, just not a good match for the system and my tastes. FWIW my speakers are large two ways using a JBL 2226 15" mid-woofer with a Beyma TPL-150H Air Motion Transformer as the tweeter, about 97dB sensitive.
