I got mine this afternoon and, well, I am impressed! These are at least good cans but I'm confident in saying easily very good. I have no problem with spending the $250 I did for them; I would also think that they are worth $300 as well...maybe more. So for $200+ these are certainly worth it imo.
As I said I don't believe in physical burn in (physics doesn't allow it, at least after a very brief time at most, so I can't), and as for psychological, well these sounded great the instant I put them on which was a very good thing as I have never liked any piece of gear that I have not at least, upon the first few seconds of hearing it, thought was at least good. No matter how much time I have given gear to grow on me, I've never had any 180 changes from my first impressions. So I was merely hoping to not be disappointed at first and not only was I not, I was impressed.
After listening to these for a few hours with much of my material (about a terabyte of FLAC files ranging through all sorts of music genres but mostly rock/pop) and getting used to the sound I'm not finding any true glaring flaw. There are some things that they don't do quite as well as I'd like if I was to have the perfect headphones, but, well, I don't think those exist at this or any price. I will say that these are not for bass heads or "warm" heads. The sound signature is crisp, even slightly dry, airy, revealing, analytical, and very detailed (but not distractingly so) yet not too clinical with a good overall non fatiguing balance as well as some nice PRaT, snap, and energy (that I was sorely missing in my 702's) with, imo, the perfect amount of bass: my kind of sound!
More later, but as of now I'm not only satisfied with these but also think that these are the best headphones I have or have ever heard (all listed in my sig except for the 600's which I borrowed from a friend for a long period). I have not done a direct comparison with my 702's yet (I can't stop listening to these!) but I'm already confident the Shure's do everything better. I'm glad I took the risk to do what could have just been a "side grade" or "flavor grade" instead of upgrade because otherwise I'd still be listening to the 702's (or much worse the 770's for when I need closed cans), which, while I was satisfied with them, always seemed to be lacking in certain areas ever since I got them about a year ago, even if I have enjoyed them very much and do think they are good cans. Such risks are well worth it when the pay off is like this!
PS: Comfort is very good except that the ear pads are a bit shallow. I don't have big ears or ears that stick out far, but they do sit on them a bit: the mesh over the driver is pretty much right up against them. It's not uncomfortable so much as a bit annoying. The 702's do beat them in this aspect.