We will be on the Liberty in a few weeks. I chose it because of the route that was available on our date and also the many, many activities available on the ship for our children.
I am also happy to say that we've been planning this trip for a year, so I was lucky enough to watch the airfare and jumped when I thought it was the best deal for 6 of us. We are flying out of Columbus, OH to Miami for $179 each (round trip). Not too bad considering Royal Caribbean had offered to provide airfare for $530 per person... ha!