We were on the Star Princess in March - got on in Chile 3 days after the 8.8 earthquake so we missed several of our ports and didn't get around the Horn. We were disappointed and decided we'd try again in the future and include Antarctica on the itinerary -- then we heard about the big ships not going down there anymore after this coming season.
Well, we bit the bullet and decided to book the Star Princess again in December over Christmas and New Years to see Antarctica and the penguins we missed in March.