Silicon labs ZGM230 ZG23 programming

Does anyone have any experience with these DYI Z-wave boards?
How hard would it be to use one to build a battery powered dry contact Z-Wave switch? (for use in low voltage projects or in wall switches without a neutral)

The documentation seems straight forward, but all of the reviews is that they next to impossible to program and there seems to be zero github or youtube projects using this board.

Can anyone point me in the right direction with these?