I have the first CRAMPS board assembled and mostly checked out. There are a few minor glitches (see the ToDo file on github), but so far no serious problems or anything that makes the current PCB design useless. I have an example LinuxCNC configuration available if you want to try things out on your own. The configuration requires you install my new Universal BeagleBone I/O Overlay, which can be used to switch between most "interesting" hardware options for the various I/O pins without having to load multiple overlays or possibly merge several incompatible overlay files by hand.
If you're a fan of scary movies, I even made a video:
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