Mine just arrived today and I've been listening to them for hours. They are simply amazing. Granted, these are my first set of real cans(I've always been an IEM user), but they sound fabulous. And I haven't even did any modding.
I think the only mod I'm brave enough to try is the quarter mod. But I'm so happy with the sound that I really don't see a reason to at this point. The mod that I really want to do is get a cushioned headband for it. The ear cushions are fine(and I love the style of the phones, I personally don't see why everyone likes to mod for the look). After hours of use my ears do not hurt a bit. And it's not that the top of my head hurts, it's just that there's a little pressure on it from the band. If I can find a post that shows how to properly bend the headband then I'll try that before getting a cushioned one.