I have had this lock about a year now. Still on the original batteries. It is great not having to have a key when I go for an early morning run. Also great for my kids (who live away from home) when they show up unexpectedly. No worry about them forgetting their keys (just the code and they can call us for that). Also great for when we travel and my wife panics thinking she left the stove/iron/curler etc on. We simply call a neighbor, give them the code and they can put her mind at ease.
The lock was simple to install and program. That was my biggest worry when I purchased it. But I had no troubles at all doing it myself with the instructions included. A simple lock to install.