We have Elite Status on Celebrity which says, we are fans!
Our previous Celebrity Cruise was on the Millennium as well... Vancouver to Japan. We were on Concierge level which, to be honest, is not worth the extra. Friends were on Aqua and were raving about it, We had wanted to even see the Blu restaurant and even the Concierge couldn't arrange it. WE found a 'deal' on Aqua for this cruise so booked it. Loved the shower. Tried to get some good non-allergic pillows. The first one was like a brick. The 2nd was like a dishrag. I wrote a comment to the Accommodations Manager but received no comment back. The room attendant tried his best but to no avail.
The food in Blu was good... but nothing outstanding... I sent back a rack of Lamb that was raw... and on another occasion a steak that was tough. My wife returned a chicken breast that was so tough she couldn't cut it. SECRET: you can order off the regular dining room menu... or virtually anything else ... so just ask.