The tires I lust after. I don't care whether they are clincher, tubular or even the size. (It matters only once the wheels and bike are given.) Those tires have "the ride", A ride I haven't known since I rode the Clement Setas of my racing days. Heavier (as a clincher) but no valve bump. Sweet, sweet, sweet. Road grip. They roll. And the 28c's completely disappear. Those tires, tubular, in say 25c, on light wheels would be the dream ride for your longest day ever in the saddle. Best rubber ever and the casings aren't far off those silks (and far more practical!)

Edit: I just noticed those are the Speeds. My experience is with their heavier "everyday" version and my comments apply to those lesser tires. The Speeds might be still nicer.

Ben