I'm largely with the cow, at least when it comes to personal travel. If I'm paying, I'm flying up front, one way or another, but would buy Tango on a Y-only cabin.

For work, due to travel policies, I'm basically stuck with Flex (unless no Flex available, or P/Z is cheaper) within North America, but usually can plan my travel to make sure I can upgrade. Overseas, I can still do paid J.