Just got my X5 yesterday. My impressions will be mostly for the hardware/ergonomics/usability as I suck at describing sound and it's been done countless times already.
-Sound quality is brilliant, rials my Theorem 720 Dac/Amp easily, to my ears. I even found one song where the Fiio X5 revealed OBVIOUS compression artefacts where as the Theorem plays the song fine, so I guess the X5 is more revealing(better detailing?) which is a plus. I've been mostly purchasing 44/16 .wav's from Beatport (98% of listening is EDM), trying to cut down on my mp3's anyway so it's fine.
-Flimsy scroll wheel: check. Seems a bit worse then the first batch received in Canada, from which my local headphone shop took a unit out as a demo, which I tested prior.
-I wish the prev/next buttons were a bit harder to press. I've hit them by accident in my pocket when I was trying to feel for the play/pause button very lightly. I'm sure I'll get used to it, but if those buttons get significantly easier to press with wear and tear, the unit will become un-pocketable/unusable for me. Thankfully, the local headphone shop here can do warranty replacements in-store for Fiio, provided there is stock. He orders 25 units at a time and there's a waiting list. They are usually gone within a week lol.
-The unit aesthetics are brilliant as expected. Brilliant paint job, albeit chips a bit easily near the microsd slots (as per the store's demo model).
-On FW 2.0, it powers on a 2.5" Sata SSD as the light is on, on the Sata to USB adapter (see pic below). Can't read it regardless if formatted in NTFS/FAT32/FAT/exFAT and regardless if songs are on the root or not. Will probably require a few more firmware upgrades for it to work. 1TB SSD is possible (Crucial 1TB SSD goes for $475 sometimes, not bad)
-Had two hangs on FW 2.0, not 100% stable. Was playing a .flac file and fast forwarding on first crash, second one happened while the device was in my pocket, playing.
Overall the unit is 9.5/10 based on my expectations. I did a lot of research prior to purchasing so I knew about most of the issues. The only reason I deducted .5 points is the easy-to-press forward/back buttons. I could probably replace the microswitches myself but the unit looks hard to open. I'm not seeing any screws.
With Fiio working on OTG storage support through FW, I will soon be purchasing the upcoming Patriot 1TB USB stick and sticking it to the back of the device. Max flash storage in the future should be 1.5TB (1TB OTG + 2x 256GB cards). For some reason amazon.ca (I'm on Canada) sells the Sandisk 128GB MicroSD for $200 where as on amazon.com sells for $120 so I just went with a cheap 64GB Kingston class 10 for now. Works fine.
While I would not personally use HDD storage with my X5, the possibility of 2TB 2.5" 5400RPm drives is there, as they don't require external power. I assume that would have a great effect on battery life as HDD's are not as power efficient as SSD's/usb sticks.
Edited by Scorpion667 - 5/2/14 at 10:43am