"My 2-year old loves the previous issue motorised Duplo trains since he can push them along by himself, or use the big green button to start them going and stop them as he pleases. On this new train, however, you can't push it along by itself - it will always start running, which limits his play options. (It also requires quite a shove which will also sometimes move and therefore break apart the train tracks it is resting on). Also, weirdly, it doesn't auto-power down when left idle - it just sits there, not moving, but draining its battery unless an adult thinks to turn it over and notice the blue light. Maybe it powers off eventually, but it hadn't after a few hours of not being used.
The bluetooth app is not an essential part of the toy, but is poorly designed for very young children since only a small part of the phone interface is given to the train control, so the distance to move from full speed forward to full speed reverse is tiny (and on a modern iPhone is also near the edge of the screen and thus triggers other parts of the OS interface).
Overall I find it hard to believe this has had much testing at the lower end of its target age range, since it's natural for little kids to want to push along their trains themselves sometimes."