thanks, I have been looking at these and was wondering if anyone had any experience with them in terms of the build quality. I don't need anything too rugged, mostly because I am looking for something that I could put into my bag to take my cans and HIFI-M8 back and forth from the office and home. The guy you mentioned does make this case: http://www.ebay.com/itm/Black-Hard-case-Storage-Pioneer-HDJ-2000-1000-HDJ2000-HDJ1000-dj-headphones-/261173394572?pt=US_Rack_Cases_Hard_Cases_Bags&hash=item3ccf25bc8c with a nice foam insert and I just contacted him to see if he would be interested in making this setup for other cans.
That looks nearly identical to the Hifiman case.
On the squarish, non-customized ones, one of the zipper pulls had come off of its track. If you aren't doing any rugged handling, the quality can still be good.
Also google flight cases for headsets. They seem pretty nice for reasonable prices and some have extra pockets that might house the HifiM8.