I've been looking online at Duplo sets like the ones below but I'm not quite sure how they work. Do kids actually build the vehicles, etc? If not, is there any advantage to buying the Duplo vehicles/people/animals over any other brand, like say FP's Little People?
http://www.toysrus.com/product/index...ductId=3497098
http://www.toysrus.com/product/index...ductId=3498760
http://www.toysrus.com/product/index...ductId=3498755