i always used a king römer quickfix for both me daughters
with no problem was best tested and still easy to install
and get out of the the car .
in fact mine is for sale :-)(in holland )
http://www.marktplaats.nl/index.php?...879436.html%3F
but seriously this is a perfect seat for children up to 15 kg
when the girls became older we started using the romer kid
greetings MArt