What's good:
Fantastic Sound, my current equipment is the limiting factor here.
Build Quality is top notch, no sharp edges
Ample Storage Space
Lineout, Digital Out
The Internal Headphone amp sounds pretty close to the O2 amp at low gain setting
Ability to use the two headphone out + line out together(but volume is across the board)
Apple File format support
What's not so good:
VERY Expensive
Heavy, not pocket friendly
Low Battery Life
Standby mode and Wifi drains battery
Heat, this thing runs quite warm, not recommend to put in a seal bag
Transfer rate: 8mb/sec or less
Laggy UI
Screen is not sensitive enough, have to use quite abit of pressure
tends to skip if you play around with the player(finding songs or etc)
Hiss with high gain.
Volume control does not work if player is on standby mode/locked. Only works unlocked.
Bugs, yes this thing has bugs and will crash once in a while.