I have this switch working well, and it was super easy to setup and control using Advanced Button Controller (much easier than the Smart Lighting app for what I needed in this particular instance. I linked it below but my steps were:
-added the github for this DTH
-Install DTH
-Add switch to classic Smartthings app
-Added Advanced Button Controller (ABC) app
-setup what I needed through the ABC app.
I paid 15$ on Amazon for this switch. I’m not sure how long it will last but first impressions are great. 15$ for a battery operated switch that fits over existing switches and essentially has 4 buttons for 15$ is well worth it. Good luck to anyone setting this up!