Just finished a wonderful 13 day Transatlantic crossing on Celebrity Solstice (departed Fort Lauderdale May 1, 2011 arrived Barcelona, Spain on May 14, 2011).
I was in cabin 7276, starboard side unobstructed, non-Concierge class balcony classified as category 2A. This was a great cabin. Being midships right over the stabilizers meant I experienced much less ship motion than my friends in cabins at the bow of the ship, high up (deck 12) in Aqua Class, or in Sky Suites at the very stern of the ship. The crossing itself was not rocky at all. In fact on several days the ocean looked like a lake with an almost glassy smooth surface. But we did have some days with typical deep ocean swells and I slept very well unlike people in some cabins on higher decks or at either end of the ship. Sometimes you can feel the stabilizers push the ship against the swell, and it is a rather re-assuring feeling.
Cabin 7276 sleeps 5 people: two twin beds (which I had made up into one big bed), then one bed that can drop from the ceiling, then the couch, then the trundle bed under the couch. It can be joined with cabin 7274 for a family configuration of adjoining rooms with a common door to the hallway.
This cabin is right at the middle of the giant X seen on the side of the ship. Some people call this the "bump" section of the ship. The Bump really consists of 2 cabins with angled larger balconies, then 10 cabins all in a row, then another 2 cabins with angled larger balconies. The lifeboats end/begin after the cabins with angled balconies. Cabin 7276 is almost right in the middle of the row of 10 cabins and has a flat fronted balcony with a clear view over the promenade on Deck 5 below, and looks directly out to sea.
Cabins on the Solstice alternate in configuration of the bed being either closer to the balcony or the restroom. The beds in Cabin 7276 are closer to the bathroom with the desk area right next to the balcony door.
Although close to the elevators which ride through a giant chimney that channels sound up the atrium to all decks, there is a wall between the elevator lobby and the hallway to this cabin and thus 7276 is a really quiet cabin. Because the Team Earth "living room" is right on this floor it is a great place for friends and family to meet/gather on port days before leaving the ship together. The proximity to the aft stairs means that it is very easy to get to the Oceanview Cafe on Deck 14 (there is no deck 13 on this ship).
There is ample storage - but not alot of hanging space in this cabin. The bathroom is large with lots of shelves and drawers for storage. The shower is very nice and big enough for two people at once. You can also use the cupboards above the bed as well as the storage space above the mini fridge to store items.
I have traveled Concierge class before but I did not miss those amenities in this cabin at all. As far as I could tell, the square footage between the cabins in Aqua class, Concierge class and A1 were exactly the same. Aqua class rooms, however, had two shower heads (one from above, one from below) that was sorta cool. I got to eat in Blu a couple of times. The reviews on it were mixed. People who tended to want a more insular experience liked Blu. Others who liked to mix more did not like it as much. The food was not noticably better.
Overall, the Solstice was fantastic. You'll love it.