Received the LCD-XC & X and have first unpacked the XC at work to listen through the WA7 and even with no burn-in there are literally tears from my eyes listening to pretty much anything.  Overwhelmingly beautiful sound and supreme comfort with the most impressive build quality I have ever seen.  Care in packaging and attention to detail is unmatched. No question this dislodges my T5p in terms of sound.  Little heavy but not unbearable and to be honest for this sound I don't even care.  My neck will get stronger.  Imagine it can only even get better after some burn-in, but it doesn't need it for sure.  This is undoubtedly endgame for me.
 
Can't wait to open the LCD-X and have a listen at home...
 
 
-- Home --
 
Well I just couldn't wait to get home to break open the LCD-X and so I pulled them out as well at work.  A very well matched sonic signature to the XC just with a more open sound stage and airier presentation as anticipated.  I am quite frankly in love with both headphones and the weight so far has not presented any issue, infact they are the most comfortable headphones I have ever felt.
 
Spent the evening burning in the XC and comparing them to both the T5p and T1.  The T5p may stay in the stable for a more practical and portable on the go rig but the T1 will most surely be up for sale soon along with a number of other headphones that these are pushing out of the airplane.
 
 
-- Disclaimer --
 
To everyone imagining this is a review, it isn't.  It is just documentation of my impressions as I go...  Don't go out buying these based on anything I did or didn't say.  I will not be held responsible for your enjoyment of them once you realize none of it was true and all of it was true at once.
 
 
-- Months Later --
 
My early impressions haven't changed.  These are the best headphones bar none.  This is now a review.

Comparing these to my Philips L1 and my Beyer T1 they have a lot more mid-bass through midrange and are slightly tilted toward the high.  They sound great but quite a bit different sound signature which I need to get used to.  My other headphones are T5p which I have yet to compare them to and Ety ER-4s.  In general all my previous phones have a less aggressive sound to them. Less mid-bass in your face.  Very very efficient, almost double the volume as the L1 and over triple the volume of the T1.  It puts a lot of music and detail across the entire spectrum in your head not light on any frequency and not missing any detail.  As I said it can be a little tiring after coming from the L1 or T1 which are much more laid back sounding.  
 
Build is top notch for the price, very solid.  Cable is a bit over-engineered especially if you are planning to use this portably.  I only wish it came with a straight 4' cable rather then the coiled 9' one since I will be using it on the road but one nice thing is the cable is a simple 3.5mm male to male so you can replace it with anything you want.  I will replace it with a simple super light weight $5 3' off amazon.  I'm one of those people who doesn't see great value though in thick or heavy cabling.  Super-silver oxygen free pure copper it all sounds the same to me in lengths under 10 feet.
 
Will have to see how the 7520 performs with cabin noise but it does seem to isolate better then the L1 and I am guessing the stronger midrange and bass might come through better with more background noise.  I can't stand the cable of the L1 which is one of the big reasons I was looking for something different. [size=x-small]Not sure if I will sell the L1 even though this was meant to replace it because I also like that signature and I bought that at the intro price rather then the steep discount now being offered online.  It just isn't worth the loss in value to let go of seeing as they still sound great, will probably just [/size]re-cable[size=x-small] them.  [/size]
 
[size=x-small]Edit: After 30 hours of burn in with white and pink noise they sound much more balanced.  The mid-bass hump seems to have diminished and both ends have opened up.  Getting used to the sound as well and they are starting to really impress me.  However my new complaint is that they really need another quarter inch of ear cushion thickness to help soften the feel and also to lift the drivers a bit so they aren't touching your ear like mine do.  Not quite as soft (plush or cushy) feeling against the ears as I am used to with either of the L1 or T1 or T5p.  I am starting to get used to that as well but it would really help in terms of comfort and even give a better seal to have slightly thicker pads which I don't think would have cost more or cause any sound quality issues.  In fact I think adding this foam would perhaps improve the sound slightly, as I said there is plenty of sound output so distancing the driver slightly from the ear may give a more laid back feel.  If anyone knows how to make a mod to add say a quarter inch of memory foam behind the stock pads I am all ears.[/size]  Also if anyone has any comments regarding possibly removing the light cloth mesh inside the cups between my ears and the driver I am considering that as well.  Currently my ears touch the mesh and it is a little aggravating.

I have had this unit now for a week and am fully impressed.  Right out of the box and without any burn-in it delivers breathtaking tone to instruments and vocals alike.  Solid power and strong bass drive even with hard to drive headphones.  Switching to some efficient T5p's still leaves the volume pot at 12:00 with a strong performance.  Clearly attention to detail was paid in getting the 1/8 and 1/4 ports matched in volume.  My only complaints being at this price point it would have been nice to have a sabre dac inside instead of a ti compromises slightly the crispness of the signal when used as a dac and it not being able to output as a dac to the rca outputs at the same time as the headphones.  Would have been nice to have a tube pre-amped volume controlled rca out mode.