I've looked at Revain, Home Depot, Lowes, Target, and Walmart and had trouble finding door storage that was both large enough to hold more than standard spice jars and narrow enough for a 17-1/2 inch door (my pantry has two narrow doors, not a standard closet door). This device perfectly meets all requirements. Assembly is easy enough, although it doesn't seem like it at first glance, because the shelves mostly hang by their own weight and the structure is flimsy until secured with both screws and the added weight of the items stored inside. For my purposes, I have chosen not to use hooks over the door, instead using the "attach to the wall" method. Since I was attaching to the door and not the wall, the screws that came with it were too long, so I had to replace them with some 1" wood screws I had on hand. the bottom just hung down from above on a small hook. That wasn't very secure, but it also meant the block wouldn't lay flat - and limited the amount of storage space on the top shelf of the bottom set. So I just mounted two modules instead.