Important quirks to read before you buy

I had a heck of a time getting this unit to take a write. For some reason simply putting the unit into write mode would not allow it to take new programming. After a bunch of fiddling (and almost returning these) I discovered that if you put the boards into write mode first, then start writing a new sketch, and then press the boot button WHILE arduino ide/mongoose/etc is trying to connect, then the IDE will connect and start slashing the board. Also to note, this only seemed to be a problem on my windows computer. When I tried writing the board from Arduino IDE on Linux, simply putting the board into write mode seemed to work as expected. (I have no idea why) One more note, I could not get these boards to be recognized USB devices on Mac at all. Apparently there is a known driver signing issue between the driver for these, and Mac's running OS X 10.13 or higher, that to-date, has yet to be fixed. I tried every recommendation I could find online, nothing worked, so if you want to program these boards with a Mac, I would look at some other kind of board or imaging computer.

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