I bought this to replace a much loved very durable and stable Galt marble run used by my older children when young. My youngest son (6) wanted a bigger marble run and liked one he had used at school which was wooden (quadrilla - i think). However it was priced at around £80 - outside my budget. So I went for this having read good things about quercetti and being attracted by its colour scheme and size. I had never actually seen one in real life though. My son was really excited opening the large box - he is a very good little engineer (builds Lego technic from plans without help and K'nex advanced sets etc. However, he found this tricky going - the plastic is quite flexible and he pushed it together a bit hard - which caused the structure to fall apart. My husband helped him in the end and got quite frustrated himself. When we constructed the elevator we just couldn't get the pick up hooks to lift the marbles and had to put them on by hand - although it did deposit them to fall down the run at the top. My son was disappointed and has only played with it twice since buying it almost a year ago. He had a friend around who touched it a bit roughly and it fell apart. Overall, not a good investment for us - I think a cheaper wooden one (or the smaller set of quadrilla) would have been better or just more boxes of our old Galt set.