I have been using this one since August of 2014.
I have the model with the built in keypad. Price was a bit steep, but it is still one of my favorite trailer mods. I can use a key fob remote, or type in a code of my choosing to lock/unlock the door. I have a backup key in case the batteries die. On rainy days I can lock/unlock from the cab of my truck. Lock uses AA batteries, supposed to last about 6 months. The only complaint that I have had was that it barely covered the factory lock opening.