We have used the original Compass for a number of year for three kids and it works very well. We decided to get two of the fancier versions of the Compass for use in a different car. The new seat, the B570, is beautiful and very comfortable to sit in. The problem is the part of the seat that the shoulder harness feeds through. It is very narrow and difficult to thread. The belt gets caught. My twins can belt themselves into their B570 but need to be belted into the B570. I would gladly swap the B570 for the less expensive B505.