Took Hurtigruten's MS Roald Amundsen to do an Antarctica cruise and could not have enjoyed the trip more. Let's do Pros, Cons, and It Is What It Is, shall we?
1) Our captain was brilliant; he threw the itinerary out the window and just worked with what the weather gave us instead of trying to meet some arbitrary calendar appointment. Because of that, we were able to have the best weather possible for each of our planned and unplanned destinations, and that's saying quite a bit since the weather was fickle to the extreme. We stayed ahead of or out of reach of every storm (and there were many), except for the sudden onset hurricane force winds that trapped us inside Deception Island's caldera for several hours and stranded some of our passengers ashore until a window could open to get them back aboard. If you take this cruise, pray you get this kind of captain. Flexibility (and a sense of humor and adventure) is key to a good trip.