I am really glad I went with the August Pro.  It works amazingly fast with Siri, I just say unlock and bang it unlocks, no delay.  The auto unlock works really well too, I get out of the lift and by the time I have taken my shoes off the door is unlocked.  If I come up the stairs it is unlocked right as I get to the door.  
Really all you want to know from a review is does the product do what they say it does, and yes, yes it does.  Very happy I went with this one.  Having setup a lot of smart home products the setup here is really smooth as well.
You can really tell they are on their 3rd generation of this product.