I received them a little while ago, but I forgot about this thread. I remembered about it when I was typing a URL and this thread was a suggestion.
My initial impression of the cans was they were anemic sounding, but I'm accustomed to a very full sounding sound system. After a while, though, I understand why all the reviews for them state that their best suited to lighter music. I can best compare them to studio monitors (speakers) without a subwoofer. Though the bass is present, it is in no way overbearing nor very exciting - a bass guitar or drum will still punch, but its more like a punch from a child.
Compared to my modded Sennheiser HD428's, they definitely have a lighter and much cleaner tone. They make violins sound woodier, if that makes any sense. I haven't found the sibilance unbearable, though present. I have a pair of Image S4's that are worse.
As for fit, they hug my head tighter than the HD428's and HS1A's. I can shake my head and they'll stay put. However, they aren't so tight as to be annoying. The felt earcups feel nice over the ear and I suspect are behind the non-exciting bass.