The storage space is quite large compared to other over-the-toilet storage, and is much deeper cabinet than most. It also sits above the standard toilet high enough to be able to remove the tank lid. 

The reason I only gave it 3 stars out of five is that you have to attach the two side legs to the rest of the cabinet. It is not the full length of the cabinet, so the legs are not stabilized by the cabinet and shelf. This became an issues in trying to place the cabinet over the toilet and my husband just about broke one off. We've used other over-the-toilet cabinets in the past and the side legs were all one piece built into the cabinet, which made it very stable. We stabilized the unit by mounting to wall.