Bought this from Massdrop directly and used it as my second setup. I am the original owner and comes with the original shipping box, power supply and owner's manual. Functionally perfect. There is a very small nick at the top left corner of the amp. Everything else looks pristine. Please check the pictures for exact condition.
This amp comes with both single-ended (SE) and balanced output. The main reason to buy this headphone will be for the balanced output (2.8 watts according to specs). The SE output is good but not much better than Magni Heresy. I had three different setups, so this amp is lightly used. I am culling my audio collection to maintain just one setup.