We have had them since DS was about 2.5, and he is 4 now. He likes the remote control aspect a lot (we don't have many toys that take batteries, so he loves that they "do" something), but prefers to just drive them around the floor and not on the tracks. if they aren't placed on the tracks just right, they won't go and sometimes it is hard to tell if they are on right - which, to him, is really frustrating.