I have two different kits, one for my guinea pigs and one for my kids school books. I had something like this about 20 years ago when I was in college and I really hoped they were equal. Unfortunately they aren't as strong - the wires are thinner, MUCH easier to bend and deform. So I don't care that much. I've included a picture of both use cases as well as a picture of one of the warped shelves. However, they are great for a guinea pig cage and their flexibility is actually a plus for that purpose as I was able to make a ramp and hay patches out of the extra netting. These are 9x9 grids if you want to use them for guinea pigs.
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