We gave this roller coaster to our two year old for Christmas and she loves it!  My husband put it together and said it took some time...about 3 hours, but the instructions were easy to follow.  Just a lot of screws and bolts.  My 2 year old can push the car up the steps and push herself down.  We had fun for hours for the past couple days so far.  Just need a bigger place to store it.