I've got mine for a week now, really happy with it, CD's have never sounded so good before. After years on head-fi I've discovered that I enjoy music much more when it's on a physical medium ( CD, LP ) and played through loudspeakers, so I have no interest in connecting it to a PC or playing high resolution files, or connecting it to a headphone amp. From some initial reviews I've read I was afraid that the Qutest would sound cold and clinical with CD's, but luckily that's not the case at all. I liked the sound from the first song I've played on it, but after a couple of days of operation the sound has improved even further. Some initial hardness or edginess disappeared after the first day of burn-in, after that I didn't notice any significant change in sound anymore. The Qutest now sounds well balanced and warm with great high frequency resolution and extension, instruments are very well separated ( even on some rather Lo-fi recordings ). I've also never heard such a deep soundstage and great imaging in my current room with my current speakers ( B&W 705S2 ) before, with the Qutest I'm now getting close to what I was able to get in my previous room, very impressive. PRaT ( pace, rhythm and timing is excellent as well since I can't seem to keep my feet still. The incisive filter hasn't yet sounded too bright to me ( my PrimaLuna tube amp may have something to do with that as well ) and other filters seem to loose some of the high frequency detail and extension that makes this DAC so special. I've also tried both optical and BNC digital feeds from the same source ( Cambridge Audio CXC ) and I prefer the RCA to BNC connection. So far I've only tried 2v and 3 Volt output and I think I prefer 3 Volt, but I will need to do more tests to be sure. Still using the stock power supply, I've got easy access to medical grade Linear Power Supplies, so a nice 5V 1amp one is on it's way, I'll report back if I can hear a difference. I've used a similar one for my phono preamp and it made a huge difference. Very happy with my purchase so far.