possibly poor usability in general.
the annoying thing for IEMs is also - high output impedance. (cowon d2/d2+ plus minus rockbox would be about perfect if not for that and resulting somewhat questionable sound for IEMs)
a personal gripe is lack of expandability or poor battery life or inability to manage music by folder and tag (folder if fine but being able to select and enqueue and search is good)
I've settled on a Clip+ + rockbox 3.13 (cheap, low ouput impedance, 10h battery life on flac, tiny, pretty stable and usable).
DX50 looked promising - but android and a bit big. Fiio X3 - the build quality seems meh, and firmware?
I was thinking of going premium android phone with a microsd card slot (one less box to carry around. oh and yea, I don't want a 3inch screen android music player ) + but my lossless audio android experience on my Nexus 4 hasn't been great (no exp card, sometimes dropsouts, very bad battery life, no h/w button control (maybe i didn't look at poweramp closely enough, clunky UI in poweramp). Premium android phones usually cost a fortune... and I don't really know if I want an $800 phone that will unlikely to get N+1 or N+2 Android os updates in case of security updates or usability/functional improvements.
I think I'll buy another clip+ now. small/light, practically disposable, acceptable usability, expandable to 64gb.
until something else comes along.
Edited by svyr - 9/28/13 at 7:05am