We have a Quicksmart and bought it second hand from eBay so didn't pay full price. We purchased it for the purpose of plane travel. It folds into a backpack so you can take it on as carryon luggage. This has proved to be invaluable as you can keep a toddler strapped in after checking in luggage

We also keep it in the footwell behind the seat and it fits perfectly but I probably only use it once a week or less. If it's just for the car I would probably get a cheaper, easier one but if you intend to travel esp overseas I highly recommend it.