BTW, for anyone who is just looking for plain on/off switch that doesn’t require a neutral wire and doesn’t need a dimmer, ecolink has just released two new battery-powered zwave smart switch covers which go over the existing switch and physically move it. These don’t require any wiring. There is one for toggle switches and one for rocker switches. People are just starting to try these so there aren’t any reviews on them yet, but it’s another possibility for some use cases.
If you had previously considered a Switchmate and decided against it because it doesn’t integrate with SmartThings, the new eco-link would be a good alternative to consider.