We took an eastbound transatlantic, spent a month in Europe on two other cruises, and took a westbound transatlantic back to New York. We had ample time to explore the ship and find our likes and dislikes.
CON: (1) Our Verizon I-phones did not work for calls and texting, even though they worked fine on Royal Caribbean during the same vacation period. In addition, the internet was extremely slow, though you would expect this in the middle of the ocean. (2) The dress code is ridiculous. I know there has been much discussion and it will continue forever. We don't like the fanfare of the dining room, and eat exclusively in the buffet area or smaller areas, like Chef's Galley or Golden Lion Pub, on all cruise ships. It is understandable if some people enjoy dressing up every single night, but there are some who do not. We should not be excluded from the theater and other parts of the ship, only the dining room. This is how it is on most other cruise ships. Yes, we can stay off of the ship entirely, but it was going in the right direction at the right time.
(3) There is no central gathering area, such as the atrium on Princess, or the Promenade on Royal. Everyone sits around reading in little corners or sleeping on deck chairs. There is really no place to go if you don't hang out in bars.
PROS: There were four excellent lecturers on our cruises. They were very knowledgeable and very interesting speakers. The evening shows were standard cruise fare--OK, but not memorable. There are numerous tables for two in the buffet dining room, unlike on other ships we have been on where there are mostly tables for six and the staff tries to put strangers at your table. The buffet food was mostly good quality, though there was not as much selection as you would like. Desserts were adequate. Chef's Galley has great hamburgers and fries at lunch, and great pasta and salad in the evening, in addition to freshly-made pizza.
Would we do it again? Yes, if it were going where we want to go.