My eldest daughter is almost 6.5, just shy of 48" and around 41 pounds. She rides in the Britax Frontier. We are looking around for a second car seat for the nanny's car and I'm intrigued by the Bubblebum for a couple reasons. While I don't feel comfortable having her ride in a booster the majority of the time, I would be okay with it occassionally in a nanny's car and second, this seems like a great thing to travel with.
How safe is this car seat? What else should I know about it?