We started from Chicago and winter travel can be chancy. Luckily our travel agent had made the arrangements and they were excellent, so had no problems in getting out of Chicago or coming back in, other than adjusting to the cold weather. Having an 11:00 am flight on the return was not an issue, we were able to disembark in one of the 1st groups and there were more than enough shuttle vans to get a large group to the airport.
As for the ship, Allure is not really different than Oasis. The shows were fun and even amazing, especially the Aquatheater. We made all our show reservations on-line before the cruise. When we sailed on Oasis we did not do that and did not get the best times; so recommend booking as soon as they open up.
The cabin was the same as Oasis, large enough for us and they have seemed to add more storage areas which is very good. My wife had no problems in getting all her shoes into the closet! The iPod dock was great and allowed us to listen to the music we wanted in the stateroom. The best staff member was our cabin attendant who managed to keep everything clean is spite of one of our boys sleeping until noon whenever he could.
The main restaurant on Allure was disappointing, the food was good but not great and the service seemed to disappear after the main course was served. Many times the main dining area was only 1/2 to 2/3 filled so I am not sure what the problem would have been. We had the same problem on Oasis; I think these ships have gotten too big. We did eat at Chops Grille and I would highly recommend that. We had reservations for 150 Central Park but canceled as we did not think most of the group would enjoy the menu.
The Solarium is highly recommended to get away from the noise and bustle of a rowdy crowd. It was our favorite spot although deck chairs seem to be reserved even though it was against ship's policy. People would have their towels down at 9 am and then wander away for a couple of hours.
I am not sure we would go back on either Oasis or Allure again, just too large. I think we will go for a smaller ship.