Diamond card, mainly flying SFO-TPE (on the old 747's).

Upgrades from Economy to Deluxe: ? (I haven't purchased Economy in a long time, but I assume it would be pretty high, since Economy seems to sell out before Deluxe.)
Upgrades from Deluxe to Business: 10% (Business is almost always sold out on this route.)
Upgrades from Business to First: 50% (First is very rarely sold out.)
Flying for 50% cheaper than on the US airlines: Priceless.