The 6 year old girl I bought this for was delighted with it, quickly learning to build her own marble run designs. She wants to play with this toy every day, most of the day and it's us who are asking her to play with something else instead when we tire of (read: get a headache from!) the sound of marbles travelling through this. Educationally, this makes her consider the path the marble will fall, construction techniques and stability. There are a few places this toy could be improved such as the three prong plastic attachments that can go on top of the spiral cup things are rather frail and hard to fit so I don't see those lasting very long, however they aren't essential.