I don't have the Buzz but we had a Strider and use the seat which is similar to the Buzz design from about 2-3 mths because Izzy loved to be upright and not lying flat all the time. We used our bassinette a totoal of twice while we were away! We used a sleeping bag with the seat so it was nice and snug thorughout winter. We also used a carrier for the first month or so at shops and markets etc while she was so little and will be doing the same this time around so that we will have one in a carrier and one in a stroller! HtH!