I can say I'm impressed.
Heard a few tracks and I couldn't stop listening. I'm the "skip-skip-skip-skip-until-I-find-a-song-I'm-in-the-mood-to-listen" kinda guy, and I didn't skip any of the songs I had on the library, it is very fun very engaging media player, which was what I was looking for. I don't care too much about technicalities, but maybe it's the raw power the device has that makes all the spectrum very accentuated and accurate.
I have the Walkman Z1060 and the Walkman A865, both of which are regarded as very fun media players, and I like them a lot, but they feel thin in comparison (Both are the dreaded European capped version though), as if the X3 adds a new layer of something.
I'm 200€ poorer, but I feel a bit happier.
Will continue testing.