I bought four of these EzyRollers for a grandson and grandnephews, this Christmas. They were easy to assemble, had extensions for when they grow taller, and they were an absolute HIT! Seeing all of the little guys learning how to maneuver them and then race down the driveway was incredible! Great core exercise and coordination builder! The tools that are included allowed my 6 year old to put it together, although the vehicle is really sturdy and well-built. I want an adult size!