May I join in on the conversation, even though this is a year old? My family is flying out to CA to visit with BIL, and we will have an 8 yo & twin 5 yos (all girls). Our current car seats are dionos, and they are a BEAR to get in & out of the car (so we're not taking them). We plan on getting booster seats for the girls, and I had planned on getting the Mifold until I read the above statements... Are they really all that bad? Is there *anything* that's packable like that, that is more recommended? I don't want to have to lug suitcases, a purse, and three traditional boosters while herding three kids.
ETA: If I end up buying "real" booster seats, I'll need them to fit three across in both my husband's sedan and my midsize SUV. (both Volvos, if that helps any)