I was just thinking about the safeguard go hybrid, in fact I even asked the KDM foundation if it would be just as safe to get that and they said a big fat NO. That it was best for rare "grandma trips". I was wondering if anyone used these and why it's not safe. If booster seats are safe it would seem this is too especially since it has a 5-point harness. It seems safer than say a booster with 86-y harness.