Meh, I have som Z-wave switches in the house (some in-wall rockers, some wall-wart smart plugs) and the experience has been mixed. Flaky switches (GE-branded), flaky firmware (SmartThings hub), etc.
I'll be happy when/if Thread becomes the norm and I can just run everything through Apple HomeKit. Though for some reason, I still don't see a Thread in-wall dimmer available, which seems crazy to me.