Partly because of this thread I bought some Supersonics and latex tubes for the track bike. Tires are here, not sure if the tubes will make it in time for Match Sprints on Friday.

I'm looking forward to the higher pressures (planning on running 145 in the rear and 130 in the front, at 210 lbs on Mavic Ellipse (which people say are good to 150+, Mavic says 138)). This should make a big difference over the 120/120 I'm running now in the GP4000S, plus the lower rolling resistance of the tire, plus lower rolling resistance of the latex. I'll see how it goes.