The best upgrade we've ever gotten (which will probably never happen again in our lifetime!) was from 6D to a Catagory 12, suite w/private balcony. And not just one cabin, bu TWO! We had prev booked two, with our son & his friend in the next one. We were totally jazzed, as you can imagine!
Lucky kids, we couldn't afford to go on a cruise when I was 17, much less have my own suite! haha This was on the Carnival Paradise, God rest her previously sweet air atmosphere...
8/92 Mex. Riv. Commodore
9/98, 9/00, 9/02 & 7/04 Caribbean - Paradise
10/00, 08/05 Pac. Wtrs. Holiday, Monarch
04/06 Hawaii - Celebrity Summit
09/07 Alaska - Celebrity Summit
07/09 Western Caribbean RCCL Liberty of the Seas