I have a 3 month old and a 3.5 year old and I'd like a double buggy for occasional use. I don't want to spend more than about 150 pounds. I've been looking at the Buggypod and the Marco Sky L. I like the fact that they both look really convenient. My concern is that they both say they can only be used until the child is 15kg. My little boy is already 17kg. Has anyone used either of these items with larger children? I'd also be interested to hear of anyone's experiences with these products in general. Many thanks!