When I first put this together, I really liked this piece.  It was relatively easy to follow the assembly instructions, and it looked like it was a nice piece of furniture.  Unfortunately, after moving it half a dozen times, it started to lean to one side.  In trying to fix it, I actually made it worse.  I had to turn it upside down to access the screws for the top shelf.  One of the screws that hold the top on was stripped and I couldn't remove it.  When I uprighted it, it was really tilting and the thing was falling apart.  I finally had to make the decision to euthanize the poor cart and put it out of its misery.  

Had I known that it couldn't withstand being moved, I would never have put the rollers on.