I've only ran it for a few hours so far on test speakers, the system it was built for is running off a modded QED A270 at the minute as I am re-building the pre-amp into a new case. HackerNAP no.2 was built using the same front-end regs, the only real difference was the transformers used and it sounds noticeably better than the "standard" HackerNAP I built, detail and separation are improved.
The plan for this amp is to drive my Frugalhorn XL's with Mark Audio 10.3M drivers, I am about to start the build.