Originally Posted by
canadiancow
Except as P25K, you get upgrade credits, and can use those two upgrade more than 1 in 100 flights.
Having dipped into the P25k and E35k ranges a number of times, I've had a number of complimentary upgrades and eups clear (albeit with the Eups not as often as when I as se100k).
I've even gotten op-uped on a UA flight YYC-ORD as a *S (different of course).