My son has just become 3 and with a size of about 1m now too big for the previous child seat. We chose because of the good test results for the Cybex. Installation simple and the Isofix seat is firmly attached to the car, because nothing wobbles. On vacation, we use booster seats because they are smaller and easier to transport, but I think that just are very small 3-year-old still for it. When they get tired, they have no way to lean his head, unlike the Cybex. Here the head and body is largely protected from the seat. The child has more freedom than before, but also sits upright and "adult". With two children next to it there is, however, closely to the back seat because the seat wg. the lateral "airbags" but a lot of space occupied.