Much better than the UK ones? One I looked at went up to fit children 120lbs and 5ft 5" tall, ok I know you probably wouldn't want to use it that long but...
I am looking for a new seat for DS2 as he keeps escaping his. The ones in USA have the chest plate which would stop this.
I saw one via a link on here a while back which had a kind of tray thing that went on the front of the car seat sort resting on the childs legs kind of thing - wish i could find it again.