I was somewhat reluctant to buy this product because let's face it: it's expensive and you just never know if it will become a favourite or "keep in the closet and give away later" sort of thing. This is a *favourite* and if you're at all thinking about getting some sort of fun science-y kit for your child this year, this would be the one. The box says 8 and up and I think that's about right. Our Snap Circuit set came with three books. Every experiment has an OBJECTIVE clearly spelled out, a description, and a very clear illustration. So you bet I'm counting the time Emperor rigs these things up with Elf as his homeschool time. We are on Experiment #7... out of 500 or so. Yes, once I decided to go ahead and GET a set, I wanted a set that would have pretty much everything I needed unless I got super-super into it years down the road. I learnt my lesson after buying a *little* Erector set. You can build the bitty truck and then... well... you can build the bitty truck again.