I got the HD 4.30 the other day and I must say they are very decent sounding. Lots of bass for a Sennheiser headphone. At first I thought vocals sounded a bit tinny and a little distant, but I don't hear it like that that anymore. Must have gotten used to the sound quickly!
Great build, comfort, isolation and mic+remote. Just what I was looking for actually! Oh and they look gorgeous.