The SE Asia unit arrived this morning intact from Hong Kong.
I've used it a little bit (w/UM Miracle and VSonic GR07 MKI), but I'm not ready to make a final judgment on its sound. However, as far as first impressions go, my thought is that it isn't substantially better than my J3. I swapped out the microSD card from the J3 and listened to the exact same files that I've heard a hundred times. I haven't yet pinned down exactly how they differ in head-fi-speak, but no part of me said "I have to have this!" It was a bit of a bummer because I like Fiio and really want something that smokes the J3 in the sound department. I will say that soundstage is noticeably better, but nothing else stood out at me and left me gobsmacked. These are very early impressions....
I'm going to load it up with some high-res files/vinyl rips later and get to know it better. Sometimes things have a way of creeping up on you, sort of like a new set of headphones that your ears just aren't used to yet, so I may yet change my tune. I will send it off to the next person on Friday - I think that will be enough time for me, especially in light of the delay we had due to the lunar new year holiday - this leg of the tour is way behind.
I will say that I found the UI to be very easy to use - I had no trouble figuring out how to quickly navigate around the player and get it to do what I wanted. I'm not a playlist junky, so I didn't try to create any and it's just not important to me. I may try seeing what can be done later on, but if you're the type to listen to full albums, I'm confident this UI will be more than sufficient. However, the scroll wheel takes some getting used to. It is very sensitive, but I think it's one of those things that becomes second nature over time even though it may be a bit annoying at first. The player did become a bit warm after just a short while, but nothing to be concerned about.
The X5 is built like a tank - you could use it as a weapon in a pinch - it's that sturdy and has enough weight to do some damage. I put it in my shirt pocket and yeah, it felt quite a bit heavier than what I'm used to, but I think I could deal with it - I'll give it a try on my way to work tomorrow, which is my personal litmus test for portability.
That's all I've got so far, people. I'll post a more thorough review after myself and the X5 have been cheek to jowl for a substantial amount of time.