We've played with it a bunch and it's always exciting and new. If you're building a huge track, be ready to put some time and effort into it. I play with her because it requires a lot of critical thinking and planning ahead to make things work. But she's learned so much about momentum and gravity and it's awesome.
The track builds horizontally, so we end up playing on the floor and go as big as possible every time. We've created mazes and race tracks, both are so much fun to make and then play with. Most of the pieces are plastic, but it feels fairly sturdy, and the peices fit together well without snapping tightly where they'd be a pain to pull apart. The base is cardboard, sturdy cardboard, but still something to be mindful of not wrecking.
This is the first thing I've ever bought that fit nicely back into its original box! But you'll need a few gallon sized zip locks for all the pieces. I have 2 for the white track pieces, 1 for the green pieces and special pieces, 1 for all the height tiles, 1 for all the rail pieces, and a small one for marbles. We keep the pieces in the bags as we build and put them all back when we're done. It's organized and makes clean up a breeze! And they all fit in the box!!
I highly recommend this track, it's really top notch, but it's not a little kid toy, and parents of small children may find themselves doing all the building and the kiddos just playing with it afterwards. I can see my daughter enjoying this for years!!!