We used a Premier retractor until Charlie was about 20 months old and have now moved him into a Maxirider, which is from 12 - 25kgs I think? Both are by Safe and Sound and I loved the Premier and now love the maxirider. Both easy to install, comfortable for baby and like MR said, the maxi rider, though it looks like a booster, has a five point harness and anchors to the car with a strap and the seat belt combined.