Bests & Worsts Reviews from Amazon

Just received for my son's birthday, and it's going back to the store tomorrow. The uprights, which are green, have sidebrackets which "click" into place and are held at various heights by tension. Fine. However, the track then adheres to these sidebrackets via magnetic force only. So you get it set up, and everytime you brush by it, say putting a marble on the track, or adjusting something, CRASH the track comes off. Also if two marbles travel too closely together, and are on the same piece of track at the same time, the track comes off - magnets not strong enough to hold them both. The bases of the uprights are cheap, thin plastic and are not weighted so they tip easily. Then we did use it for a while (while tiptoeing around so as not to knock off any of the track)and within a half hour the magnetic motor upright, which drags the marbles back to the top stopped working. Electrical short.