Having sailed with Carnival previously, I wanted to try Celebrity or another line for comparison.
I was always intrigued by Celebrity cruise lines, and wanted to sail with them the first time, but you know, Carnival was much cheaper and we were on a tighter budget for my first cruise (May 2010).
This cruise, we were in Concierge Class, and while the champagne and fresh flowers were nice, I wouldn't pay the extra again. The hors d'ouevres weren't great, so again I wouldn't pay the extra.
Good view, except when you looked to the left from the balcony, there was a ladder thing erected for the crew. This blocked some very good camera shots. Also, in the morning, you could hear them dragging deck chairs around the pool area. Other than that, it was a good location, midship, close to the Waterfall Cafe, the pool etc.