I was given a set of the Urbanite XL through the Amazon Vine program. After trying them, I'm not overly impressed.
The midrange and treble are OK, you can tell the response isn't quite flat to the limits of my hearing (14K or so) but they are able to get there. But the big issue is a mid-bass hump around 400 Hz or so, below which the bass gradually drops off. So though these can get down to 20 - 30Hz, they really don't have much punch in that range. For cans advertised as "Take the club with you - Legendary Sennheiser sound featuring massive bass" I was a bit disappointed. And I have to agree with the earlier post that overall these sounded fine but just weren't that involving or interesting to me, at least not in comparison to my IE80s.
Comfort is OK, though the cups are not that that deep and I can feel my ears lightly touching the driver cover. I'll also note that the "case" is light fabric bag unworthy of $250 headphones.
Overall I think these are OK, but no competition for the IE80s. I have not tried the Urbanite (non-XL) or Momentums, so i can't give a comparison to these.
I'd also note that many of the reviews on Amazon are probably by those comparing these to $5 buds or whatever junk came with their phone; that's why I come here to see what people *really* think about any new products.
Sucks that they don't have the boosted low bass like HD8/7/6, HD360, and HD380.