We bought this Maxi-Cosi Pearl Car Seat for our little boy when he was about 10 months old (manufacturers recommendation is 9-18kg) as he was too big for the Maxi Cosi Pebble Car Seat. This Seat is compatible with the FamilyFix Isofix base (sold separately).
Our little boy and now little girl seem to find this seat very comfortable with its 5 different reclining positions. It is very easy to operate this luxury function from the front of the seat.
The headrest is adjustable as is the five point harness. The last feature that we really liked was that the headrest and harness are extendable which means the seat can grow with your child.