I've had several of these monitor stands before and never had any problems with them, but got a second one to add a second monitor to my home office and to my surprise it's utter rubbish. It is deformed/concave and the monitor shakes. This is nothing more than a supposedly identical product that I ordered a few years ago - it was much lighter, lighter in color and the metal was thin. There's no way he can handle 40 pounds. A normal-sized monitor is too much for him. I hope it was an accident and will try again, but it really looks like they skimped on materials and ruined a perfectly good product.
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