I've had this item for about a month now. It looks nice at first glance, but that impression fades when you start collecting things. Rather than using screws, half the device is supported by thin pieces of plastic, so only half of the Pi is securely attached to the mount and you have to wiggle around a lot to make sure the I/O connectors, a few real screws, and the plastic pins all fit together correctly. It's quite frustrating, but once you figure out how to attach the first one (and it's entirely up to you because the instructions are pretty bad), the next few will be easier. After you put everything together and did a bit of gluing it will sail pretty smooth for a month but one of the fans is pretty wobbly now and it sounds like it's grinding itself to death and since it's driving me to the wall, I probably will in the end pull the plug. It's a really great idea and could be a great product, but for $150 it's nowhere near the quality I expected.
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