The SWA reserve system is getting a lot of play in this thread. Having a brother who perpetually sits reserve over there, I'll throw in his opinion. If you're on reserve at SW you fly every day. Maybe 4-5 days a year does he not fly on a reserve day. So while I am on reserve 18-19 days, I have never been assigned responsibilities on every day of a month. So, there actually isn't that big a disparity in realized days off.
As with anything, there could be unintended consequences to some changes in our PWA, and this is one area. SWA pilots fly every day they are on reserve, which means there is no fat in their system. Which means they require fewer Pilots. Their whole system is set up to require the fewest number of pilots possible.
For reserve, I would like to see the pay raised to the ALV, or 75 hours. With the realization that reserves will fly to that, and it may require less manning.