I have installed 3 of the Kwikset 916 z-wave locks in my residence. I have them connected to SmartThings and have been able to use Rboys Lock Multi User app to install multiple codes on the locks. The locks all respond to SmartThings App on our phones instantly.
PROBLEM - When trying to use the touch screen to enter a code, the touch screen does not respond to touch right away. You can touch the screen to wakeup the key pad, but it will not accept any touches. You have to wait for the lock to go back to sleep, then touch it again to wake it up. After the second wake-up, the keypad responds and the codes can be entered. This causes an unpleasant entry delay for code users. All 3 locks behave the same way. Otherwise, they are working great.