Hi, first let me say that I was part of the beta test for this lock. I went from the previous generation lock to the version and love it. As far as size, it is my smaller than the previous gen lock. It also feels very well made compared to the older one. What I love about the lock is the auto unlocking feature. When I arrive home and approach the lock it automatically unlocks the door for me based on my phone. I can't tell you how much I love that. It is also great if you are away and need to unlock the door for someone. I have also used that quite a bit. Great lock, you will not be disappointed.