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As an IT technician in a school, I have to repair Chromebooks of many different models on a regular basis, mostly from Dell and Lenovo. I haven’t seen one that I would consider durable yet. All of them use butterfly switches that break when a child rips off the keycap, meaning the whole keyboard has to be replaced. It is also common for the brass inserts into which the hinges are screwed to pop out of the plastic on most models due to rough handling. We also had one Lenovo model where almost every device we put into service developed a no power issue due to the same ceramic capacitor going short. Of course, the display panels are just normal panels that crack when struck - that is probably the most common damage we have to deal with.
I’ve run a TR-004 for the last 5 years haven’t had any reliability issues so far. In hardware raid modes, drives are hot swappable but you can’t grow the array without wiping it. I’m JBOD mode you need to power off before swapping drives. The main problem I’ve had is their chipset is only partially supported by smartmontools due to proprietary crap so there is some strange behaviour there.