It can also be pretty good in the Oceanview category.  I booked one of the solo Oceanview cabins since I'm travelling as a single, and then was able to upgrade to a top oceanview cabin for 2 that would have cost me almost $1,000 more if I had booked it initially.  It was pure luck, because the impetus for getting CO was the smaller, quiet dining room.  The upgrade was serendipitous.