I bought two of these last year, and I assembled one for the inside of my kitchen pantry door. It wasn't hard to do, but since it was the first one, it probably took me 20 minutes. The second one only took 5 minutes! Everything about it is straightforward and clearcut. Just put the two hooks provided over the top of the door, then hang the unit by inserting the hooks through the grommets. From top to bottom, there are probably six or seven shelves. There are covered heavy pieces of cardboard for each shelf that you just slide in through the opening and place it snugly to form the sturdy shelf bottom. They even enclosed a plastic bag with different size velcro strips to put on the backside against the door to anchor it however you wish. I only used a few pieces to hold the bottom shelf still and a couple in the middle. You may wish to use more velcro if there are several people, especially children, who might be using it.
The entire unit is sturdily built, and I was able to put a lot of lightweight things on each shelf, like pouches of mashed potato mix, jello boxes, candy bars, napkins, small bags of chips and lots more. Since my pantry has heavy-duty shelves in it, that's where I keep the heavier things, like canned goods.
The second one I put inside the door of my bathroom linen closet. Again, I will put lightweight things in it like first aid supplies, such as Band-aids, tubes of ointment, and lots of other things.
I was so happy with the first two units I bought, I just got an order for two more that I plan to use on the insides of doors in two bedrooms.
I have purchased every imaginable organizing product through the years because I enjoy having everything organized. I sometimes have a hard time starting new projects, but having confidence in things like these hanging shelving units makes it so much easier to get started.
I think they are reasonably priced, sturdily built and should last a long time.