My daughter is 5. She loved it! They let her make 2 robots: one for her and one for her 20 month old cousin.
The learn about plastics in the first area. Then they move to the next area with a bunch of computers where they can play games, then they move to the robot building area.
The plastic pieces are actually made by a giant robot machine that's in the room with you. It makes pieces (legs, arms, front torso, back torso, front head, back head) of various colors and then a robot arm distributes the pieces in the appropriate bins.
The kids grab the pieces they need to put together their robot. There are tables set up where they can work. Parents are welcome.
We still have that little fella around the house.