I use the HD25-1 with the coiled cable portably daily, wearing it under a Duffle coat.
Only thing that bothered me a little in the beginning was the weight of the cable, puling the one cup a little down, plus some entangling.
I've got no problems with the aesthetics, I find both the 'phones and the coiled cable to be super cool.
If you're going to be very active/motile it might be of a bigger problem, still though, a daily 20 min walk or so to and fro lectures involves no problems in my case.
The steel/copper cable is not bad either, it surely won't keep you from enjoying the cans, plus it is considerably lighter and actually more flexible than the coiled one.