I am not in immediate need, but after a couple years with IEM's and an ATH-ES7, I am determined to get a circumaural upgrade. This is for a 'transportable' rig for home/office/hotel. I don't walk around with phones on. But I need to be able to pack into a courier bag or small backpack ... something not too cumbersome to carry into the office. So, folding and/or near indestructible headphones would be a BIG plus. I'm looking at Ultrasones HFI and PRO series because they look overbuilt, they look comfortable for foldup headphones, they can fold into a ball or lay flat (versatile for packing), and they can be driven well by most good portable amps. What I'm interested to know .... 1) how is Ultrasone's build quality? Are they as sturdy and overbuilt as they appear? Are they (physically/microphonically) noisy while being worn? I have a big noggin and headphones tend to be under stress on my head ... with the ATH-ES7, being supra-aural, I get creaks from the swivel hinges every time my ears twitch. 2) how about comfort? Whether it be the HFI or PRO series, I've seen mention here about Ultrasones being uncomfortable, but I don't really see why unless they clamp horrendously. Of course, lots of people complain about the ES7 too, and I find them very comfortable except for the aforementioned microphonic noise issue I have with them. 3) finally, given my conditions above, what other "transportable" circumaural headphones would you suggest that would be an upgrade from the ES7 and Super.fi 5 Pro I'm using now? thanks to any who can assist.