I had grobags (and other sleeping bags) when we stopped swaddling DS. But I preferred the sleeping bags for the colder weather because they have arms. Never quite understood the winter bag without arms. But I definitely swear by sleeping bags, regardless of brand! We had a 6-18 month 1 tog, which was perfect through Jan/Feb in Melbourne. The temp thing and clothing guide were very helpful too. DS is now nearly 2 and still in the sleeping bags - he stands up in them, but only ever unzips a little bit.