I can't understate how much I love the Mindstorms sets. It's almost a perfect learning toy - it's straightforward to get started (following the instructions and

I can't understate how much I love the Mindstorms sets. It's almost a perfect learning toy - it's straightforward to get started (following the instructions and building the robots) and you can easily graduate to getting creative and building other robots and programming them to do whatever. I still remember discovering how gear reductions work while playing with the original mindstorms set at age ~11. I had to explain this to high-school kids in FIRST Tech Challenge a couple years ago, they had never worked with gears before.