"Overall this could be fantastic, my grandson (lego master we call him) is six and assembled this without issue. Our main problem is with the battery pack itself. We can not get it to work beyond one time on a new set of batteries (we are on our fourth set). We sent in a request to customer service for guidance but did not receive an answer. We bought a replacement battery for the train but alas it had different connections. If we could get it to work we would love it."