I got mine because I wanted bright exterior lights that could be controlled and a powered ZigBee device to be a mesh network repeater.
The behavior you describe of the UI button saying “Turning on” or “Turning off” is the same behavior I encountered before contacting support. Sometimes my routine worked correctly, and sometimes the bulb would get stuck in an on state and stop responding to the app or the routine that was suppose to turn if off.
Fortunately I got mine on clearance for less than a standard exterior LED bulb, so it wasn’t a complete waste of money. After all the headaches the GE Link bulbs caused I can understand why they were on clearance. There is a long thread about problems with GE Link Bulb firmware.
If you have a dimmable LED bulb that you want to use as a nightlight, you could get a dimmable Z-wave plug-in module like the Aeon Labs Smart Dimmer 6. That would be a better option than the SmartThings Outlet, unless the majority of the devices on your network are Zigbee.
Currently it seems like there are fewer Zigbee than Z-wave devices on the list of compatible products. Outside of Samsung SmartThings devices, most of the Zigbee devices are different smart bulbs.