We have been offered a maxi-cosi pebble from my cousin that her little one grew out of (he's now 20 months so it's a relatively recent model). I've always said I would never get a second hand car seat because of the risks of it being in an accident/having hairline cracks etc (friends have offered theirs) but we are having twins and the costs are rising. My DH thinks as we know the history of this second hand one there isn't a problem with it and to be fair my cousin isn't the kind of person who would give it to us if it had had any kind of an accident. Am I being overly cautious? DH has said if it is that much of a worry for me then we'll spend the extra money which is about an extra £80 with a deal from halfords. Not masses but enough that I thought I'd get some other opinions.