The 511 Commuter pants get a huge thumbs up from me. As J said, gusseted crotch, lock loop, and a bit of stretch, are good. But the water resistance is a bonus, they are tough and comfortable. I'm looking to get another pair, on sale.
BMC's Santa Cruz, and that Colnago up there are both really nice. Lemond too.
Only spent a few minutes on the airless tubes, but they felt like turds. I'd rather just pump up my tires every few days. Try before you buy.