I recently had an FO who was on probation that left SWA after 5 years . He said it was night and day difference in usage of the 737. He mentioned being in PMs in the summer and always being late and rushing due to short turns. He said the effect of that every trip was fatiguing. He also told me that the technology at SWA seemed quite a bit behind as well. He told me he was very happy with his decision to leave SWA for UAL. DC area so driving to BWI vs. IAD.