I'll give you a quick rundown on all the closed phones I've been using at work the last couple years (this is an expensive hobby!):
Ultrasone hfi-700 - used them for a couple years, really liked the sound (speaker quality), but eventually wanted more midrange clarity and better comfort
Senn 280 pro - blocks out the world; clamps tight; really flat and rangeless sound quality that got boring after several months. Then I broke them in via the mexican rap station for 2 weeks, intending to kill them - they got so much better! The wife stole them after that.
Denon ahd2000, with Jena Labs 22g cryo wire - LOVED them. The midrange clarity, comfort, and how deeeeeep the bass goes is unreal. One side died after a year, and I found out Denon doesn't work on them. They don't have parts like a dedicated headphone company, just ear pads. I will probably buy another pair because the sound was really exceptional, despite the company being ****ty. I mean - the sound haunts me, I keep thinking about them when I listen to everything else.
Creative Aurvana Live! (Denon 1001) - got used for $15 on ebay, price fluctuates a lot. I really like these. Great SQ, very light, easy to wear for hours. Not quite as refined as the 2000, but my favorite sub $100 phone by far.
Ultrasone proline 650 - I just don't get it. Why does anyone like these? The sound just did not work with my ears. Weird honky midrange... hard to describe. My friends 750s didn't sound like this.
Ultrasone hfi780 w/ cryo wire 22g - to replace my old 700s. They REALLY sound like they were made by the devil for the first 120 hours. Holy crap do they hurt your ears, with high freq. crunchiness. I am surprised how different they are from the 700s. I think Ultrasone made a mistake. They are starting to smooth out, but they are so uncomfortable. Ultrasone needs a new headband design, its time guys! I am not loving the sound yet. I am surprised that it is a favorite here - it has so many flaws, but maybe it needs more time, or doesn't like my amp. The 700s I loved from day one. So far they do not "get within 90% of the Ed 9". They are definately related, just not close... yet. I'm gonna keep trying. This review is "tough love" because I do like this company.
Beyerdynamic DT770 - I just got these and had a big smile on my face the first day. So comfortable, light, and has a tone that works with me. Despite being called "bass monsters" they DO NOT reach down as low as the ahd2000, and do not have the punch of the 780s. But I am starting to hear some sophisticated clarity in the mids, and they do the low notes well. Lots of way to change the sound, I'm gonna have fun with these. They aren't quite broken in yet.
Borrowed Ed 9s - best phones I've ever heard
Borrowed Sony V6 - crunchy mids, but I liked them for work phones
Borrowed Bose triports - What?
Borrowed proline 750s - Very nice, but ultimately boring