Since there aren't many treads about these I'll give my opignon.
First for a full sized hifi headphone they are quite cheap: I paid around 90€ shipped, however I had to order in germany because I couldn't find a reseler in Belgium.
They arrive packaged in a nice box, with a stand and a 4 meters cable. The cable connects to the phone with a 2.5 mm jack (single entry), with a 3.5mm jack on the other end. The cable also has a "twist" system to lock the cable in the phones and avoid accidental disconnects (al least on the headphone side). A gold plated screw in adapter is also provided if you need a 6.3 mm plug.
The headband has a spring based adjustement system. The good is that the headphone pretty much adjust itself to your head automatically and stays well in place. The bad is that the pressure is a little more than what I would like, and I don't know about the durability of the springs. I found the confort to be slightly less than the senheiser and beyers I have tried, but still quite good, it doesn't detract from the listening. My only real buff is that the fabric covering the earpads can get irritating on long listening sessions. Also the earpads don't seems to be user replaceable.
Sound wise these are very good for the price. The first impressions that I have are clarity and precision. It is actually easier to recognize instruments with this than my Beyers DTX900 (my former top headphone). Also as mentioned before by dvw female vocals are quite good, this phone gives me the impression that the singer is right in front of me. They have quite good bass extention (the 50mm drivers probably helps there), but they don't emphase the bass much (altrough it is definitelly present and clear). If you want deep bass it's good, if you want a lot of bass it's not that great. Highs seems clear and detailled, Mids are maybe slightly weaker than the bass and highs but not much. Soundstage is quite good also (the drivers are angled, apparently that helps).
They play OK out of my Ipod headphone jack, but I find the sound better out of my PA2V2 (but then that's the case of almost all of my headphones).
I think they are a good bargain if you can get them for less than 100€. I would say they are in the same league as the senn 515 / 555, but I only had the oportunity to listen to the senns in the shop (less than ideal condtions) so it's difficult to make a definitive comparison.
Clearly they are now my best non portable general purpose headphone. I'll still use my senns HD212 pro for dance tracks that benefit for a huge bass boost, but these are better for classical, vocal, pop and even rock thanks to the clarity they deliver.