About the latest firmware update v1.10,
Lots of response improvement to the UI as mention earlier by Randius and others.
However, in terms of SQ, it took a step back IMO.
Lost that extra depth and decay in instruments presentation.
Lost a fair bit of that airy and wider soundstage.
Lost the musicality during live recording playback.
Turning on EQ helps improve the above but negligible improvements.
With EQ on (open), when screen goes to sleep, there is a significant pause in music playback while song is being played.
Gained more forward mids and highs. Basically everything got moved more in your face.
Gained greater clarity, though I love clarity, this one seems a little too much (compressed?).
In a nutshell, you have a cowon J3 on super steroids with some characteristics from DX100.
It may seem like a compliment but I felt this v1.10 update lost what made DX100 SQ's sound so magnificent.
Have already reverted to v1.03 firmware. Unfortunately, doing so I've lost gapless playback (option missing) and some glitches are back (ie. lock screen pops up in intermittent split seconds). On the bright side, got back the SQ we all fell in love with, and the UI seems to remain as responsive.
Hope iBasso can give us further firmware updates that brings the best of v1.03 and v1.10 together plus more enhancements (hopefully SQ does take a notch up this time).