Product review (5 stars): It must be installed correctly or it will not hold much.
The negative reviews are probably from people that did not get this installed correctly. If You just slide it on the door it will not work correctly. You must align the tabs of the shelf between the bumps on the door just right, then it requires a bit of pressure downward to seat them right. Done correctly I have no issue with 9 of the 12 oz beverage cans in each of these shelves.