I ended up buying this one so that the kid I nannied could stay RF in my car because she meets the height and weight for this! It works great. I’m in love. No rattling. Smooth headrest adjustment. Good price. Love the leg room. I was planning to move her back later to the FF harness booster, but tbh, if the other transitions one doesn’t work, she will just use this one FF. sigh. Anyways, I love this seat!