I have a ticket on hold that includes SFO-PHL that I am considering requesting a BXP1 upgrade for. Of course there is no C space (per EF) but I think I read somewhere (can't find it) that BXP1 upgrades are higher priority than comp EXP/500 mile upgrades. Can someone verify this? I'm debating whether it's worth up-faring and waitlisting the BXP1 or just going off the complimentary exp upgrade.