Has anyone got one of these? i want to know how easy it is to fit as i need it to go in and out of my car and DH's. I've looked up the details on the Britax site and it seems to have all the features such as easy to adjust head rest/harness position. i thought i might choose this one as it lasts from 9kgs up to 36kgs and so i wont have to get another at age 4.