I have seen these type of blocks (AND, OR, NOT, XOR, NOR, NAND etc.) before but none of them were affordable or complete. These blocks seem simple but can be a good education stuff. Also, they could be magnetically snapped or using simple connectors. What I would like to see a comprehensive sets of these redundant blocks which can make basic circuits. It would be awesome if OP-AMP blocks can be added for advanced users.