I drove my nephew around (5 next month) for 3 days and other than the fact that he's too squirmy for a booster and the head rest kept getting lowered. I'm pretty pleased with the Parkway SG. When I first buckled him he immediately started trying to put the seat belt behind his back, he only tried that once. The SG thing made a lot more sense after he showed me how it worked. I was impressed how the shoulder belt stayed stuck to his shoulder no matter how he moved. He did a lot better after the first ride when I removed some distractions. Yesterday on the way back from the Zoo he started asking about why my kid's seats where facing the other way. Then said he wanted to sit that way too, I didn't get a chance to see if he could fit though.