I bought three of these to make 2 units with 9 shelves each. I bought them to store specific items -- DVD/CD boxes that hold literally thousands of back-up and home-made DVDs and CDs -- after searching what seemed like FOREVER to find something suitable that didn't cost a fortune. (I was actually considering having a carpenter build me custom shelving, but that would have cost close to $2,000!# I took a chance on these because they were inexpensive and I knew I could use them in my garage if it turned out they didn't work for the DVD boxes. Well, they work GREAT! #See photo!#
The only negatives, and they are minor, is that assembly of the first one was a bit of a pain. The instructions tell you to screw together the poles that form the frame, then screw in the wheels, then put on the shelves. The problem is, if you are assembling these yourself -- no helper! -- this won't work, as it will be almost impossible to get the shelves over the very high poles with the legs wobbling all over. #You can lock two of the legs, but that wouldn't help much -- the first shelf is the hardest to get on as the poles of course are not really a "frame" until something is on them!)
After following instructions, I realized that wouldn't work, so I took off the wheels and separated the 4 full-length poles into 8 half-poles (as they come). THEN I was able to get the first shelf on over the plastic clips, and then the second, etc. After I had four shelves on, the unit was quite stable, and I was able to screw in the 4 half-poles to make the top half. I added the rest of the shelves, THEN propped the whole thing against my basement wall to put on the wheels, one side at a time. It wobbled a bit when I was putting the 3rd and 4th wheels on, but it wasn't really an issue as the unit was VERY stable with all the shelves.
I had no problem with the plastic clips -- once they "click" into the line where you want them (I just counted lines to make sure they were even), they held fast as I loaded the shelves.
One tip for assembly: don't assemble them until you are sure what you will store on them. Yes, you can disassemble and reassemble them, but that won't be too fun -- better to know what you will be storing at the start and plan your shelves accordingly. Taking 15 or 20 minutes to plan first will likely save you a lot of aggravation later.
And one last thing. These units come with 6 shelves PLUS the shelf liners, which a lot of the units don't come with if you buy them elsewhere. I didn't really NEED the liners for my purposes, but they are nice to have for the future if my needs change.
Overall, a GREAT purchase at an amazing price. I plan to buy the corner unit and some more of these as well for my garage. I am so impressed with them!