Hi there A friend of mine has one of these so I can answer a few of the questions. 1: She's a nanny and has had no problem with any combination of child seats and boosters. Probably an idea to see if you can try and fit them in a demonstrator 1st to make sure though 2: There's loads of room in there, I've been on quite long journeys in it without any discomfort 3: The boot is huge. I cant see you having a problem 4: Cant really help much on this one. I'm a member of the CSMA (Civil servants Motoring Association) and got a discount through them when I got my C4 (20% from Citroen London West) 5: Cant answer this one really, but its base on a van so should be built to last. My friend hasn't had any probs with hers Hope this helps