The reason that I am asking this, I'm thinking of getting a Nautilus as a second seat in my husbands car to take my daughter to school. I also have a younger 3 year old and thought it would be great to get something that he could use as well, since usually there is only one of our children in his car. If we are taking both, we use my car. I'm deciding between a Nautilus or a Monterey booster for our extra seat in my husbands car.