I broke reserve in MSP two out of the last three months, though I was call first and wanted to work. I start in ORD June 1st and I got a composite line (I'm a Dec 2011 hire). I'll almost certainly be back to reserve come fall. Everything Tchinson said is quite accurate. I really love it here. Between SkyWest and my last airline I've been commuting to reserve for the last year and a half. June will be my first month living in base and I can already tell how beneficial it's going to be for my quality of life (though, the partial line helps as well).