Bests & Worsts Reviews from Amazon

I had serious problems with some parts of this set staying connected. Often as I was trying to add on a new part, one or more of the other parts would become disconnected - usually falling off. It was dependent on what color connector I was inserting into what other color. For me, blue, purple and green connectors worked well together, but when inserted to red or yellow, they would fall out at the slightest touch. This frustrated me, and I would think it would drive children into a rage. I ended up returning this product and getting MARBLEWORKS® Marble Run Starter Set by Discovery Toys.