An update to this review. My first impression wasn't brilliant, the documentation link is dead, and although it's listed as a 3.3V part, the 5V input is a bit confusing which may sound odd. As others have pointed out, the silkscreen is odd, e.g. MOSI is marked "ST". All of this points to the fact that this thing really works. The 5V input goes to the 3.3V regulator, so yes, that part is actually the 3.3V part, at least as far as the DIO lines are concerned. I hooked it up to a Pi Zero and it worked the first time (well, the first time since I realized it has CLK and SCLK inputs). Hence three stars for functionality and what it is supposed to do. I deduct a few stars for the almost non-existent documentation and the bad lettering. Bottom line, I'll probably take a few more of these because it will work out in the end.
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