Big, sturdy shelves
Your review: I bought a set of these shelves a few years ago and loved them so much that when I gained some more storage space, I bought another set. They hold so much stuff and I don't have to worry about how heavy something is... for nearly everything I can just throw it on the shelf.
Pros: big and sturdy
Cons: some items (predictably) don't slide well on the metal grating but when I had the shelves in a tight spot that required sliding footlockers, I just put a piece of wood on the grating and it worked great.