I’ve put a few of these around the house, they don’t do dimming, but simple on/off solution is all I needed and are a pretty cheap way of getting some smart lighting on existing ‘dumb’ bulbs.
£17 each and easily retrofit over existing switches. I already have an Energenie hub, as I have the eTRVs around the house.
I then integrated into ST using this smart app
Main issue is they are one way communication with ST, so if you turn them on manually, you lose sight of if they are on or off. So I guess it depends if you need to know if a light is switched on or not manually.