This was a Christmas gift to my 9 year old daughter from her grandparents. It is the first K'nex item we've ever had or built, but it certainly won't be the last. This set is amazing--hats off to the design team at K-nex! The directions are extremely detailed and easy to follow, but my daughter did require guidance (and I had a blast working on it too!). We had wonderful discussions about the physics and engineering of roller coasters, and just as importantly, fun working together. The educational value is golden, my daughter is already drawing up plans for a coaster of her own design (for when we dismantle it) and has requested me to purchase another motor. I nearly leapt for joy, after playing Barbie for so many years!
It is also suprisingly durable. It has been set up in my family room for three weeks now, and has survived my three year old playing Batman and Hot Wheels on it, and also him falling on it (pieces needed to be reattached), and can be picked up and relocated.
Add it to your cart!....now!