I bought two - one for each grandchildren household.  My 16 month grandchild can push herself off and loves it.  Both the 15 month old and the 16 month old love just climbing up the track and sliding down on their behinds/bellies or just riding on the car around the house too.  The 4 year old loves it and even enjoys helping the younger ones.  It was easy to put together and very sturdy. You do need some straight space and most likely it's best that the space not be carpeted for them to get the longest ride.  We set one up over Christmas in the family room and they rode through the kitchen and into the dining room.   It was fun just watching them.  I highly recommend it if you have the room.