Sorry Im a complete novice re Isofix. I understand that the seat just clips into a fixed base thingy which in turn is fixed onto the Isofix hook in your car. Presumably that slightly restricts the other kids getting into the car (as some have a rod that goes down to the floor? am I imagining that?) and it sticks out more horizontally (or not). Is it because Im pregnant. I am totally incapable of making any decisions about anything!! Tell me about your great stage 0+ isofix seat an how easy it is!!!