LOL

My DJ/Production/Listening room as it stands today.      

I really have no idea what you mean by "a lot of lag."  The ONLY lag I have with the X5 is the play screen switching the name and album art from track to track if I skip a track.  The rest of the UI is quite snappy and I've experienced no lag with the audio when switching tracks.

  The UI is not as snappy as the iPod Touch or iPhone but it's also operating with much less processing power.  It's about as snappy as I recall the iPod Classic being.  I would call it "acceptable" but not "industry leading."  It's not a deal killer in my opinion.   With regard to the...

No, there is not a BIG difference.  That said, there is a noticeable difference.  The X5ii is more resolving and has a slightly broader soundstage.  The differences are more nuanced than they are "night and day."   I've owned a few around 15 Apple iDevices (various iPods, iPhones and iPads)...

  Oh my God, I had an iPAQ.  I remember that WinAmp-esq motif very well.

  Money well spent.  I've owned some semi-expensive portable gear in my time and FiiO is nothing to scoff at lately.  I prefer my X5ii over my Hifi-M8 because of the size.  The M8 sounds better but marginally and it's a PITA to walk around with.

  Great choice in music.

  They're Sennheiser IE 800s.

I'm disappointed that the screen is plastic and not glass.  For a device that costs more than $500 this is a misstep for Sony. 

bummer

      Has said answer been received?

Congrats all!

  I hope you're wrong.

  I would be flabbergasted if this device did not work with their PHA amps.  It's just a few scripts of code which would allow any ZX100 owner the ability to cough up a few hundred more $$$ on another device.  It's an easy cross-sell for Sony.

  This is a web forum where we exchange thoughts, concerns, speculation and comparison constantly.  The slightly off-tangent conversations about a product before it's release is what I find endearing about Head-Fi.  The product has not been released yet so experiential comments are almost...

  That's good speculation.  If their PR/marketing department was smart they would, since Canjam/RMAF is the perfect target audience for this device.  Fingers crossed we hear something in a week.

  Cost and battery life (which is near the best in its class).

We're usually the last to get the cool Sony products.

  US pricing has not been released yet.  It does not have a built-in line-out like the DX90, FiiOs or A&Ks, however you can buy a line-out cable that works via the WM-Port.  FiiO makes one called the L5.  I believe it may be OEM'd by Oyaide but I'm not certain about that.   I prefer the ADL...

  Haha, agreed. 

  Only speculation but I doubt it.  The ZX100 is a reasonable successor for the ZX1 based on price point it is a departure from the ZX1 given that it uses the Sony OS in lieu of Android.

I do agree with that

  In what regard?  Could you please elaborate?

  And this surprises you on Head-Fi?