I have 1 extra still if anyone is interested. I put one of them together, haven't gotten it working yet. Strangely when powered on not connected to the Mac, it detects my sd card and the image files on it, which is confirmed by the log file written to the card. But when I power on connected to the Mac, it blinks its led indicating that the sd card is not detected. Strangely one time I started up, it did seem to detect it - and I got an odd sequence of happy Mac icon for about 1 second and then immediately jumping back to a blank screen, over and over. I'm suspecting that I may have gotten one of the fake bluepill boards the project page warns you about.