My first baby grew out of his pram and car seat so quickly that I felt really upset that we had spent so much on them. It was all later sold off and now we are expecting number two I'm considering buying a 3-in-1 Britax from a friend of a friend. i've heard alot of warnings (from car-seat manufacturers) about the dangers of buying second-hand car-seats, what are the real dangers of doing this? Also if anyone knows what 3-in-1 I'm talking about can you tell me if they've ever had any problems with it. It's the chassis with the carry-cot, car-seat and pushchair attachment. Its a patterned fabric, navy with burgandy/white check its about 2 years old.