I think UA's p.s. service beats any other domestic service (and in fact I think C beats at least the US carriers' international C) hands-down. But, if upgrades are what you're after, be forewarned that they are very stingy about releasing confirmable upgrade space in advance, and they often sell out, so you can't really count on an upgrade. If you're stuck in the back, at least it's E+ BUT it's a very stingy E+ (34" and if you get a recliner in front of you, it's not very comfortable). Certainly better than AA's LRTC, but there are no exit rows in the back of the ps planes to give you any possibility of really adequate leg room.