My wife and I were on board Celebrity Reflection Dec 8 - 15, 2012. It's a beautiful ship with lots of entertainment and things to do.
It's very high tech with smart TV's in the cabins, however there seems to be a few bugs that need to ironed out. Ours didn't always work and often stalled.
We didn't like the service in the main dining room. We're use to the attention you get on HAL were waiters pull out chairs for guests, place napkins on your lap and are quick to do just about anything to make you feel welcome. This never happened on Reflection.
We booked aft cabin # 8338. It's a very long walk to nearest elevator. This didn't bother us that much but might be a concern for anyone with mobility issues.