I have to say I seriously hate this seat in booster mode, to a point where I want to get rid of it. The cover keeps coming off, the shoulder belt is always messed up. I have no idea which slot to put the SG, it has picture instructions and shows to use the one on the outer most slot, but then they show a pic of the underside and it shows the middle slot. The one on the outside is to far from her crotch. The second one fits but no matter how many times I adjust it I can't get it right, it's either too long and up to her belly button and not fully on the belt, or too short and the belt is folding in the SG. I don't think there is another booster as tall as this one. My seats are slanted so I don't really get the maximum height out of other boosters. It's so much trouble. I mean, what cars did they test the shoulder guide on, it seems like the only way it works is for the belt to be directly behind the seat. And seriously, we have to fight the belt to get it snug as in the pics.