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Looked through Amazon for some simple wall switches to tie in to my system. I see there are many. Are any brands known to be better than others? Must be z-wave for reliable repeater functionality. Most other functions (timer, etc) will be handled in SmartThings. Thanks!
What country are you in? The device selection does vary. 
If you are in North America, take a look at the device class features FAQ. The wall switch discussion starts around post 38.
Bulbs, switches and sensors, oh my....what to buy (device class features FAQ)