I deal with GM cars every day and would trust the lap belt over the "hook type anchoring device" any day. The lap belt is proven to hold back an average adult's weight in a crash. I don't have a clue what that anchoring eye hook thing is designed to hold that is connected to seat back of the rear seat. Do you? I've often wondered wtf those are actually good for. JMO. I wouldn't strap a child to them over the lap belt after taking GM cars apart and seeing what holds it and what its made of.