Some notes so far:
1a) For those who are interested in hooking up a usb stick to DX50, here is my experience - USB OTG works for my 8 GB usb stick but does not work for my 1TB Buffalo Ministation Plus external hard disk. I guess it is due to the lack of power supply for the external hard disk, which is the same case where you use the USB OTG function on an android phone.
1b) For the songs that are stored in the hooked up USB device, before the songs can appear in the "all songs" or "album" mode, it MIGHT BE necessary to use the directory (file browser) to access one song of each album. (haven't conducted extensive testing to verify this though)
2a) I also have problems with some of the .m4a files that could appear in the directory mode but could not be played.
2b) It could read and show the embedded cover art in m4a, but I am not sure whether it could detect any .jpg file located in the same folder as the cover art for other formats or for m4a files without embedded cover arts.
3) Sometimes when I power up DX50, it shows a blank screen with some backlight (which means it is actually turned on) and I need to press the power button once (to turn off the screen) and one more time (to turn on the screen) to have the normal playing screen appear.
4) When I am using the high gain mode with TF10 (32 ohms), the optimal volume for me is 140-150; with Panasonic HTF600-s (56 ohms), around 180. The maximum is 255.
5) The screen is bright and responsive, but at the time when I was typing this, the background suddenly turned blue (originally silvery) and went normal when I rebooted DX50.
6) The device looks and feels great with its brushed aluminium (not sure whether it is called that way though).
7) The device did freeze once (I was unable to turn on the screen, pause the music, adjust the volume or go to the next/previous track with the music still being played) and I had to long pressed the power button to force a shutdown.
8) The usable internal storage 5.62 GB in FAT32. (haven't done a format though because I am too lazy to copy the music again.) Could anybody having formatted the device confirm this?
9) I personally have a pair of "wooden ears" and I do not own similar devices so I am not able to offer much valuable sound impression to you guys. I would prefer to leave this to other more experienced audiophiles.
Thank you for reading all of the above! Have fun playing with this new device!
Edited by raynechan - 9/6/13 at 10:42am