Overall I'm very happy with these racks. We use them to raise laptops to a more comfortable viewing height for our kids' schoolwork. They were easy to put together and also hold up well on the table several times a day as activity changes. I took a star off my strength rating because some of the leg joints and the legs themselves aren't as strong as I'd like so I'm concerned about durability over time. I deducted a star in the ergonomics rating because while the raised screen is great, with a laptop on top the keyboard becomes larger than comfortable for typing. However, this applies to any vertical stand and can easily be circumvented by adding a peripheral keyboard to be used where more typing is done.
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