So I just picked up mine two days ago.
I now have a couple of 1st world problems:
1) The Beyerdynamic A200P that I got to go with them does not enhance the sound appreciably to my ears as compared to the regular sound out form my iPad, iPhone or Macbook.
2) It turns out that I like the super dark signature of the IE800 better than the lean and detailed signature of my main office rig (T1 on A1).
3) My on-the-go pair of Beyerdynamic DT 1350s are sorely ourclassed in terms of portability and sound isolation.
I dealt quite easily with 1) - returning the unit, which I bought used from Amazon Warehouse deals. As for 2) i already ordered a Crack with Speedball a couple of weeks ago, and hope that it will bring about a holy marriage of the better detail of the T1 and a warmer sound than the solid state A1 produces. I got a great price on the DT1350s, so perhaps I'll deal with 3) by just selling them off. Nice phones, but at a price difference factor of 4 they bloody well SHOULD be outclassed.
My only issue with the IE800s so far is that the L/R markings are almost impossible to make out for a guy in his 40s unless they are very brightly lit.