I installed a couple of these shelves in my home rack, one for AV gear and one for three heavy UPSs. The strength and stability of these shelves are very good. A shelf with three heavy blocks doesn't flex or bend at all (maybe I'm over the design limit, I'm not exactly sure) even though they are closer to the front and sides. Overall very happy with the durability. The only downside I have with it, hence the 4 stars, is that the "ears" and sides of the shelf stick out a bit - maybe a quarter of an inch into the shelf space - and certainly don't flex. The maximum width of gear you can fit in it is probably about 18-1/2" (around here) since I've had gear that was about 18-5/8" and didn't quite fit. Bought a smaller shelf that didn't waste as much space and it worked fine (then repurposed this shelf, didn't return).
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