I sat reserve for all of two weeks in STL this summer. Airport reserve is common for the days you are actually reserve, but you will be used a lot.
FWIW, I've had a good time here even with all the b-ing and moaning on this site. Upgrades should be pretty much as quick as you get the time.
Its not a perfect place, but I'd like to know the regional that we all want to retire at?