We have been fortunate enought to be upgraded on several trips. The last time was on Freedom in December of 2008. We had an Aft Corner #1300 booked and we were offered a JS
that we turned down... a couple of days later we were offered a OS so of course we then gave up the aft cabin. We have twice been upgraded to OS, twice to GS and once to JS
I will tell you that on most occasions my husband was proactive calling Crown and Anchor within the 14 days before sailing for the upgrade...