I did a LOT of research into this as I just recently finished building a house and was determined to have a smart lock on my front door. I actually found this one of the hardest decisions to make out of all of the endless decisions when building a house.
There were a lot of options, but I finally nailed it down to the Schlage Sense Smart Deadbolt (iPhone only at this stage) but was devastated after all that to find it wasn't available in NZ yet, I spoke to the NZ distributor who said its not due till later this year. It is actually available on the Apple NZ site for $499. But I ordered it from Amazon - arrived in a few days and was only $363 NZD Delivered.
Very easy to fit. Looks superb, functions really well
Can lock/unlock using Siri, Schlage App, thumb turn inside, keypad outside or normal old fashioned key, also single press locking for ease when exiting. In iOS 10 the " home" app will have geo fencing options for Auto-Locking and Unlocking.
Can set different users in the app with different codes to see when they come and go, also time based codes, and set to auto lock after a certain amount of time has passed.
I didn't have a door handle yet so ordered the matching Century F Series handle set in Brushed Nickel to go with it, also off Amazon for $192 NZD Delivered.
*Is HomeKit enabled but you do need an Apple TV within range of the lock to be able to use some features when outside of Bluetooth range of it.( An iPad will also be able to serve as the home hub instead in iOS10)
Very very pleased with it. Highly recommended.

