Super review! Any word on the street price?
I know its apples and pears stuff but in your opinion, how does the sound signature compare to the Beyer DTxxx series (DT880 if possible).
In general, I am a bit of a basshead and the 2-3 open headphones I've tried appeared to be somewhat lacking in the lower bass region. Is that true? To help me with my future upgrades, am I correct in understanding that planar magnetic headphones do not have such issues? Thanks.  

I am thinking getting a pair, do you have problems with the weight of the headphone for outdoor use?

Outdoor use? Not a good plan with open designs. You let way too much sound out, plus you will certainly get all kinds of crap blowing in. That is just my opinion.

Street price?  It'll retail for 499 at launch.  

Great insightful review. I learned a lot about this headphone from your descriptions of aspects of its sound, especially in comparison to other known quantities. Thank you for providing a realistic review and not cluttering HF with fanboi jibberish. Unfortunately, people will read that you only gave it four stars instead of five, so they will be scared away from it.

Awesome review, Matt. Thanks for taking the time to write this up. Further feeds my need to have this headphone in the future.

I haven't read more than the first sentence, but, boy, that's one way to open a review:
 
"No matter how good the sound of a headphone, if you have a model that is poorly constructed or prone to break it will be difficult to enjoy and appreciate them in the long run."
 
Ah, all good. Cleared up in the next sentence. Was afraid I'd have to run away!

Hi, great writeup and thanks for the review.  Just a quick question, did you purchase these or were they loaned to you for the purpose of this review?

How does it compare to an HE-400 with the treble problems corrected with EQ?