I bought this 4 months ago, after I locked myself out of the house, with my keys 2 hours away. I use it daily and it is always flawless and easy to use. Really great for when I have guests because I can just give them a code and they can come and go as needed, without me being home. The back part is plastic that feels a little cheap, but it's held up well so far. Aside, from that, I really can't fault this lock for anything. Can't recommend it enough.