I had one for 2-3 years and it was meh, ok. The main issue that I had with it is upper treble extension - or lack thereof it. PS gently rolls off the highs for some unknown reason and this ended up being what did the unit in for me. Combo with with one of their P12 regenerators and it's way too much. I was coming from record/turntable listening, so I didn't really know any better. I thought maybe a high end DAC was supposed to make digital sound more like the relaxed highs from an analog rig. But little did I know...
Even my Ayre Codex PC DAC sounded better in the end, so I moved it into my main system and sold the PS while awaiting a new QX-5 Twenty from Ayre. I love that thing.