We have been on previous cruises on Royal and wanted to try Norwegian.
The breakaway ship is Ok but not designed for the amount of people that were onboard. We sailed at full capacity and getting to the food, walking around the hallways and taking part in any gathering of people was sheer chaos. People bumping into each other, getting a table at the buffet was a hassle and the food selection was always the same.
We went with a stroller for our 2 year old but waking to our cabin was nearly impossible because the hallways are super narrow and always filled with the room staff carts. We had to roll the carts into other rooms to be able to pass.