I think these kits are great. I've purchased two like kits since February. My foster 7 yo granddaughter took to them right away. It required supervision for the first 5-6 projects. Then less for the next one. The last three almost no assistance needed. Now she follows instructions really well and looks for the details for proper assembly. From setting out all the parts to putting it together. Fun to watch her gain expertise and get wicked excited with the results.

The screws are small, very small. Get a real screwdriver with a big handle. Much easier that way. Get a hobby hammer, small needle nose pliers, and plywood sheet to work on as well to protect the able top. The axels and spindles are too hard for a 7 yo to push wheels and pulleys on. Easier to tap with a small hammer. The tiny screwdriver is useless.

She is so proud of her accomplishments with these projects. Take the opportunity to talk in real terms like electricity flows through water like water through a pipe. A switch is like a faucet handle feeding a hose.. Etc... Explain the motion, how it works etc. some of this will sink in and some will be realized in the future.

Have Fun

My 6 year old grandson likes this very much but it is challenging for a 6 yr. old.

bought for x-mas for my 9 year old son, he loved this, kept him occupied and concentrated for a long time.
he loves projects and this was perfect.

Let me starts with the pros:
My seven year old loves this kit, and we had a wonderful time building the projects together!
Everything turned out really cool and worked great once it was built. Again, my son loved every project, so it was definitely worth the money for us to have a great time together and to learn some engineering skills. :)
Now for the cons:
If you are looking for something for your child under the age of 10 to build by him or herself, this may not be for you. The tiny screws were really difficult for my son to hold, let alone use, and the directions were very lacking. Between the directions included and my prior knowledge of similar projects, I was able to figure out how to put everything together, but the instructions are definitely not detailed enough for someone who has no previous experience or doesn't like solving puzzles.

My kid loves these. I would give a higher review if they were a little easier. The screwdriver that came with it was not exactly a Phillip's head. It looked like it had been cut off halfway through the head. It wouldn't work at all. I didn't really care about that. Some of the screws aren't quite long enough so it is frustrating for a kid. Otherwise, really great. This is the second of these kits we've purchased and would purchase them again. Like I said, my son absolutely loves these, and unlike other kits, you can build all of the things instead of building one, taking it apart and building a different thing with the same pieces.