I thought I'd let you all know how I'm making out with the Schwalbes.
I have one glued onto a Zipp 404 for the front and the other glued to a disc. They seem like nice tires, I can't think of anything good or bad to say about them, which I guess is good. I have 5 or 6 race days on them so far, and I can tell you with certainty that if anything's holding my racing back, it's not the tires. I do like that they don't lose a lot of pressure, even overnight. The Vittorias would be almost flat in 24 hours.
For what it's worth, I have a Vittoria Pista CS Elite glued to the rear 404 and can't feel any difference between it and the Schwalbe.
Long story short, I like them. They're kind of expensive, so that'll factor into my decision when they need replacing.
PI