Styrofoam packing material jammed up the glides, screw holes in the back didn't line up properly, and when we removed the screws to try again we found the backing material to be too soft to screw into again.  Ball bearings fell out of glides.  Also it was terribly smelly - its been a week and there is still a very strong chemical smell coming from it.  Would have returned it if we hadn't already spent 2 hours putting it together.  This is a piece of junk, not worth the money.