Our family of 4 (2 adults, 2 kids age 12 and 14) had a great experience on the RC Navigator! Our only real cruise experience before this was on Disney. It really depends on the ages of your kids, but for mine, I would pick Royal Caribbean over Disney big time.
Our check in was very easy-we basically just walked on board! We did take a few 12 packs of soda and a case of water in our bags, and they made it on board no problem!
Our rooms were great-kids had an inside cabin, my husband and I had a balcony room. We actually didn't even see our kids much on our days at sea because they were so busy with all the activities in the teen room. The 12-17 activities were very well organized-the kids even had their own activities planner/director and she was GREAT!! My kids rate this cruise 5+++. They enjoyed Disney, but this was a whole different ballgame, and it was GREAT.
Great room (6356) but our bed was very hard and we are not used to a hard bed.