Child > 7 years old to sit comfortably and comfortably. The only thing is that on long trips, during sleep, there is now nothing to hold your head like in a full-fledged chair.
Has some pros:
For me, the most important thing was the absence of empty space between the car seat and the booster during installation. Many models sin with this, people have to put pillows between the back of the child and the chair . It also feels like high-quality materials and not flimsy construction, isofix mount, aSee full review