So I have heard - and this is why I did recommend them as the alternative in the first page of this thread. Although I will never recommend them over a decent stereo headphones.
As far as the comfort goes, I have had my share of comfortable headphones and again not so comfortable ones. A few of them were from Sennheiser as well.
One of the earlier models from Sharkoon I owned, Cosmic 5.1 had great wearing comfort. Since I see that Medusa 5.1 is using the more or less the same principle, I can imagine how nice they do sit on ones head.