Just fine! I had issues interfacing with my Astron 10 Amp supply, but it was related to having the wrong DC plug. The correct size is 2.1 ID x 5.5 OD. I wonder if they are having issues with the wall wart? Because in using the variable supply, you really have to get the voltage at 15 or it just won't turn on. I'd go back there and suggest they measure the voltage on the plug, anything less than 15 will be an issue.
Honestly its behaving really great, but I wish I could hear it with the linear supply. It's handled my AKGs wonderfully. The ESS 422s come out louder, and with their usual smoothness, and great detail in the bass.
It's a really enjoyable experience, and makes both sound close to planar magnetics driven by good gear. Real easy to forget listening to it. :)
Let's see though, my Shure E4cs are the real challenge. They are the most sensitive, but in the bass they can be fussy. With anything less than a stellar amp they sound thin, or boomy. They do really well with the DX3.
One odd thing, switching rapidly with my Fiio X5 ... the X5 sounds faster. As if the tempo was increased... but that's clearly not true. :) The tempo is identical..