Managed to get 10 minutes with it. Took it in toilet to have a listen in total silence. Great news for me was I detect minimal hiss (L-Gain) with my SE846's so looks like I don't have to use the iFi iEMatch or 75 Ohm impedance adapter
Within 10 minutes of use its a "Keeper" for me. Initial impact is that its certainly not quite to the level of Chord Mojo but not far off and better than ZX2 I had (or just prefer signature to the Sony). Not tried balanced yet or compared to my HA-2SE.
In-line remote function doing strange things but still to update to latest firmware. My cheapo cable off ebay which work perfectly with Samsung/Sony phones doesn't do anything on the X5III yet my Klipsch X10i with iPhone controls works for play/pause and for some reason even volume up, but not volume down !
Just tried a couple of FLAC 24/192 and 128DSD tracks.
Main testing bits