We bought these for our booster vacation rental cars: promises kept aside minimal space and comfort for children. However, our two booster one is plump daily, and you still have to point out that is long enough to install them! Indeed if we want real security it must pass the belt when the two red plastic guides on either side of the seat: impossible to do by children, so we need to focus even everyone, even of our great 8 years! And impossible to do for grandparents ... which eventually give up and do not attach them correctly!
As there is no competitor in the market I do not regret my purchase, but as soon as another brand is a fastening system more convenient, I sold off my two seats bubble bum!
