The Safety 1st Apex Booster Seat lives up to its name and achieves a perfect 5 stars in the CREP safety test protection rating – albeit on the previous methodology. It does have AirProtect side impact protection and height and headrest adjustability. In the event that you are in an accident, Safety 1st will replace your car seat with a new for old replacement, free of charge. You just need to apply within 31 days of the accident. The downside of this booster seat is that is a premium priced booster seat.