I just got back from having the car seat inspected and while they told me I did a great job installing it , they also told me that it should not be tethered in the rear facing position. But I'm not sure that they are right. They admitted that they don't know much about the britax carseats because they are just new on the Canadian market but that the recommendations for rear facing are not to teher. To have some give so the child's head is not the only thing that moves and everything else is stationary. Now I picture my 6 month old's head being whipped around and into the back of the seat. Does anyone know why britax's are recommended to be tethered rear facing? :-(