I have exactly same problem... device once froze, after a reset thing is pausing songs all the time, even when locked. This tend to happen every time to I move a device, so seems to be a problem with hardware not a software update...   It doesn't sound good that you have to send device to...

What I had to do is turn off pci express link state power management in advanced settings of power management. Now works great. 

I have weird problem... It seems that on my personal laptop [Asus N73SM] after connecting the musical fidelity v90-hpa sounds play nice, but after I pause the music, after several seconds you hear quiet "click" sound, like when you turn on/off sound card. And then when I press play you hear...

Hey, just in advance - I am not part of this is project! I just find this idea awesome! Of course I am sure that people who spent hundreds on cables won't use it but I would love to see this in production. What do you guys think?  ...

I think the problem with the subject is that not many people had a chance to listen FiiO, So for a time being it will be hard to find an answer... 

 Try this one:   http://www.amazon.co.uk/Sennheiser-MDR-7509HD-MDR-V900HD-Steelseries-headphones-black/dp/B009SAF9XQ/ref=pd_cp_ce_2   I have it, and it works for both Z7 and AH-D600 I own, and they deliver to NL!

  So should I just assume that both sound good and the decision I should make only base on the additional features: if I need them or not?

So both devices seem to be similar. Multipurpose USB DAC and headphone amp..    It is hard for me to figure out which one is better.   I am wondering which one is more reliable and most important, which one will be more compatible with various PCs and other devices...    Maybe somebody...

How many hours did you already spend with them? I am somewhere after "lack of texture with some recordings"... But I have been using them maybe 10h so far...

    True, in the end it is only 20 euro extra. None of other options have possibility of upgrading.

  Yeah, everybody would prefer to get the amp for 1000$ instead of 350-450 $... 

I have a question to all you guys (maybe it was asked already)   I am planning to buy some Amp/Dac for the office.. Do you think Fulla is better than FIIO E10K OLYMPUS 2?

  I am at work now so only decent source now is Fiio X1. And so far I am listening to Z7 for an hour and I do feel that they get more clearer and detailed. Just in case I checked if it is my brain and I switched back to AH-D600... No it is definitely not my brain.    I guess they need some...

When I check the price Silver Dragon V3 for Z7, Kimber Kable seems to be a bargain