Rather disfortuitously I only have the webcam in my laptop at this time so this is the best I could do even after cleaning up a bit.
Absolutely the biggest most obvious difference in the low end. It now actually has a rounded sound, its no longer that thinly academic, coughing mouse bass, its not turned into a monster or anything, it's never going to I suspect, be capable of that. More importantly, its suddenly a lot more fun and much more enjoyable with my trashy pop music like Eiffel 65! It's also comfier, weight spread over the head and the ears > just the head.
There's the loss of that "air" that you have with further from the ear drivers (K1000 effect I'm sure we all know of) but frankly, for my ears, the choice is piss easy, I may not be a classical music buff like Mr Durrenmatt, but I can't believe that he didn't try this sort of design. Then again it's possible that he really didn't and just went with a continuation of the Jecklin Float chassis and the principles behind it because he likes that.
Me, I like it this way. These drivers will not be going back in the original housing. Trouble is of course that I cannot leave them as they are. Sellotape and a cut up HD201 do not the best chassis make.