It is a work in progress - works fine but the switch itself does not update the smartthings when you manually turn them on or off. Ie if only use the phone app you will not have a problem. But say you turn off the switch with the app and then manually turn it on, on the wall plate, the ST will still think it is off. If you now want to turn it off with the app you will have to turn it on with the app (even though it is on) and then off to get it to go off with the app. Not a huge problem, but a hiccup non-the-less.
This is only a problem with 2 and 3 gang switches - due to ST poor handling of multi endpoint zigbee devices. The single gang works fine.
Will see if I can fix this over the Chrissy-NY break.