Isofix is great. When you first install bit fiddly, but then totally easy! Very good is also that you can reap the Isofixhalterung completely into the seat back when the seat has a non-Isofixplatz times. Belt guide is class. My boys (3 & 6 years) can buckle up alone.
Hook: The headrest is very broad. I have two seats side by side, as I look through the rear-view mirror is not much.