I've had mine for about a week now. Seriously LOVE this thing.
I wanted/needed a balanced DAC to go between several inputs (PC-USB, DAP-COAX and DAP-Optical) - and out to my Stax 353. I have files up to 24/192 and DSD-12.
The only thing that hung me up was the remote. You have to hit "C" on the remote before it will work. Weird, but it's sort-of explained in the manual.
Before I had this hooked up, I had a Cambridge DAC, connected via SE out.
I've tested it through all my file types/sample rates, and the screen picks them all up instantly. It basically covers everything.
As far as I can tell, this DAC is completely and utterly silent. No noise, no hum, no added anything. It's like a passive converter box in the middle.
The headphone amp wasn't something I really needed, but since it has a balanced output, and I have another pair of balanced headphones, I tried that out also. Not a LOT of punch, but definitely enough for my HD650's connected via 4-pin balanced connector.
Overall I'm more than happy with this little beast. I call it a beast because it's quite heavy. I have not opened it up, but from the pics I've seen it's got a decent transformer, and the case is solid metal, so I'm hoping there isn't a Beats-like weight inside to make it feel more substantial.