I am currently running-in an Underwood modified PS Audio GCPH. It has adjustable gain, loading, and both balanced and single-ended outputs. I only have about 8 hours of music through it, but it is quiet, smooth, and detailed. Reportedly, it requires 200 hours of break in, but it is going well so far. Oh, I had to ditch the stock power cord as it is really crappy. All I had around was a Zu Bok, and that seems to be working ok.
Although it is not run in yet, there is obviously potential, but I have to reserve final judgement (only my opinion).
Although it is not run in yet, there is obviously potential, but I have to reserve final judgement (only my opinion).