Our grandgirls love this roller coaster... they are four and two and it's so easy for them to use also... they can walk the car up the track themselves and take turns... it only takes a minute to assemble and is made of quality plastic... I would recommend it to anyone... I got this smaller coaster to get them ready to   the extreme coaster that is waiting... it can also be used indoors or outdoors, just make sure they have plenty of "run" space....