+more pay (10-25%) more kudos,more time off in summer,sense of giving something back, so long as you train rather than just check. Next rung up to management.
-more contact with management, stuck in Box over winter, often in Hotac, hard to keep current on MFF, ALC's sitting on the jumpseat for hours.
quite a few give it up over lifestyle issues, but it will always look good on the CV.