"This is an awesome set. In particular the app that allows to control the train is a lot of unexpected fun. It controls the train movement, honks, reacts to action bricks - it offers minigames that feature other parts of the set. It would be nice if the manual about the electric train was more detailed - it seems to have features. Such as one axle is motorized and the other has a motion sensor. So making the train run, it is actually easier to slightly lift the back wheels and push rather than just push. It was a little tricky to properly insert the batteries but they seem to last quite a bit. The train seems to have quite a bit of power and can pull several pieces. It would be good to have two green action bricks - then the tracks could be linear rather than a loop."