I have ordered it today. Maybe I can review it in a few weeks. :-)

Very annoyed! Followed video tutorial and installed upgrade kit without incident. Flashed the latest hex file and commenced test when I noticed the two material cooling fans smoked checked itself. So now I have two dead fans. I ordered this upgrade via Indiegogo and I'm very upset about the lack of detailed instructions.

How do I get replacement fans for this upgrade?
Also the tutorial did not explain which fan plugs were to be plugged into the daughter board.

I have just gotten the missing height sensor cable so my kit is complete and it is now mounted. I wonder if a firmware update is needed for my Overlord Pro to use the height sensor during calibration?