Duplo quality is there! My two year old daughter has no worries for max out track. The train that never stops turning looks to be very strong (there has already been much abused). The batteries have not been changed and still progressing very well. This box is fascinating because of all the activities in one box: the treadmill, the gas station, crane, gates, truck, train and two carriages, multiplied by all the possibilities of assemblies different. My girls love the different sounds (not too loud) and everyone (even their grandfather) has taken the game of the train! Only one desire: add accessories!