Thanks for the info, J!
We switched Jasper over to a big boy seat a couple of months ago. I spent forever installing it, and I think it's in good. The latch strap on the rear/top of the seat was new to me. With dd1 and dd2, there was just the latch on the base. Actually, with dd1 there was no latch. It wasn't mandatory on cars until 2002 and my car was a 2000 back then. I Anyway, I keep meaning to get Jasper's seat checked... I'm pretty sure it's fine, though. It's very tight... barely moves. :)
ETA Big boy seat that is rear facing, of course!
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