I'm running 28mm Pirelli P Zero Race TLRs on Zipp Firecrests and rate them. Getting them on was no harder than other tyres and the beads popped straight away. Took a little while to seal properly but that was the valves rather than the tyres. Good cornering grip and nice supple ride over the rough stuff.
I'm on the lookout for a tan wall 28mm that suits hookless rims.