Don't buy a used car seat! You don't know what it's been through. We have the Keyfit 30 travel system. Love the carseat... not so much with the stroller. If I could go back I would have just gotten the carseat and the snap n go, then get a nice umbrella stroller for when they are out of the infant seat.
We have the Chicco KeyFit 30 travel system with an extra base. The carseat we LOVE, my daughter was in it until she was a year (she is petite) and was comfortable. We didn't use the stroller at all as we had a Bob that we used instead- looking back I would JUST buy the carseat but would definitely buy this seat again- we plan on using it for our second.
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