We went with Celebrity Expeditions to the Galapagos about 8 years ago and thought that experience could not be topped. We were wrong. I did extensive research on all the different Antarctic cruises. Most cost the same, all have zodiacs with naturalists, all have food included. None have alcohol included and the luxury experience you get with Silversea. The ship is a smaller icebreaker but lovely cabins and dining room. It did look a little ready for refurbishment in some places but overall was very nice.
But the biggest thing of all is the Antarctic. We were extremely lucky on our Drake passages, they were calm and uneventful. We had a mid-ship cabin on the third floor which was very stable. Our window was very large but there were excellent shades to cover so that us light sensitive sleepers could rest. The bathroom was large, had a tub and was mostly done in marble. I was shocked. We got a fantastic table at the rear of the ship and had amazing views. The maître d'hôtel, Anna was very gracious. The chef was wonderful and often came to the dining room to be sure we enjoyed our food (which was divine). We usually stopped at two ports per day. Most were shore landings but there were a few zodiac cruises. Everything was outstanding.
We were very lucky to have fantastic weather and saw an amazing array of animals. Other people got tired of the penguins but I think they are crazy. Mid-January was a perfect time to go as most of the penguins and birds were just hatching chicks. We actually got to see a penguin chick hatching from an egg! It was funny to watch them squabble over tiny rocks and slide across the ice. Then they would jump in the water and be the picture of speed and grace. We saw lots of seals, orcas and seabirds. We saw many whales (humpbacks, minke) and were very lucky that our captain stopped the boat for an hour so we could watch a group play.