I have a 2009 model, made in NZ one and my girls fit in it perfectly. My DD2 will be 3 in Sept and weighs 16kgs.

I'd stick with the older one. I don't have any experience with the newer ones so can't really comment on them but my older one is so sturdy that I imagine it would be near impossible to damage it. Even with kids the age of mine, I still use it every week and its never let me down.