Lots of people ride clinchers on ADT, and I've seen Roger and a lot of the riders he coaches on Ellipses.
I ride Ellipses with Rubino Pro tires sometimes, and tubulars other times. Sometimes I even ride one of each.
Tubulars definitely feel better (at least to me)-- I use Vittoria Evo Pista's on my race wheels, but I ride intervals and open sessions on clinchers or tubulars. I started riding the clinchers more lately when a couple friends had unexplained sidewall tears and weren't sure which track or what they were from.