We have this brand lock on our front door, but have around 5 doors that need locks on our home and external garage. This one we received to review went on our external garage. The smart app is easy to operate. We've had our garage broken into once, so we are really happy with this product. It actually comes with the battery and easy to follow instructions. There are always adjustments to be made when adding a new lock, but my husband is a master electrician and carpenter. We like the ability to add codes and users to our 
lock. We like how reliable the app has been for us. Overall,  it's a brand we can rely on. We have no complaints.