You can't beat this unit for the price. I've got the full power of the equipment and it's solid. Show no influence, don't scare me. The different parts fit together well, all the hardware is there and it's easy to expand and change to the required configuration depth. Although the blocks are labeled for each 1U, they aren't numbered, which is a minor drawback. For $20 you can put a 42U magnetic stripe and label on it. This makes it a bit harder to align left and right if you don't have any devices. But not so much willing to be paying a premium between this and what other companies offer for the price. The big downside is the instructions and installation. Drawings are few, no clear diagram of how the parts fit and where exactly. And you should definitely not do the installation alone if you can help. If you are unfamiliar with this type of rack mounting, you can use the images from Revain's listing as a helpful assembly guide.
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