We gave Madison the Learning Resources - Gears! Gears! Gears! Lights and Action Building Set for her birthday, and it has been a huge hit in my house. I say in my house, since I think my husband has had as much fun as Madison playing with it. The age is 5 and up on it. However, Madison was able to play with it, and she just turned four. She didn’t have quite the attention span to play with it like my husband who spent an hour last night building the picture that is on the front of the packaging. It somewhat complicated (not as complicated as say business performance management software) because they have to understand how to make multiple gears move at the same time. I like that this comes in its own container, so that you are able to put the pieces back in there. Also, there are very few little pieces, so I don’t have to worry about Will so much. This is still something she’ll have to play at the table with. However, since it is motorized, she absolutely loves to sit there and make everything turn. That alone makes it worth purchasing. There are also several different sets. I think we may get the Learning Resources Gears! Gears! Gears! Safari Express Motorized Set next.