We have sailed on the Millennium and Infinity (sister ships) and by far the Summit was the best of the three. It was clean, staff was outstanding and the food in Blu was excellent. the team of people in Blu, from the host to the maitre-d to the waiter was the best team we have experienced on the many Celebrity cruises we have taken. The only down-side on the Millennium Class ships we have been on is the deck in the A1 Cabins. A1 is suppose to be a good cabin location and is except for the BALCONY. On each ship one cannot use the balcony after a rain as the balcony does not drain and remains flooded. We did ask to have this corrected on the ships and it was never done! Recommendation, do not book an A1 cabin.