Battery life has been good so far. We have teenagers and this beats them losing keys

Why should an expensive key be flimsy. It is very hard to open this lock with the key I couldn't do it even following the directions. What happens I'd the batteries go back and you need in. If I where to purchase it again I wouldn't

I have this doorknob on my home office door, where I have a few firearms stored. It's very easy to use, and the numbers are very clear. The instructions are also surprisingly good. One cool thing about this is that as long as your combination is somewhere in the string of number you press, the door will unlock. So for instance, if your combo is 1-2-3, and you press 5-6-7-1-2-3-9-8-7, the door will unlock, even though your combo is in the middle of the series. This is good so that the numbers don't get worn out for you pressing the same buttons over and over again, and, probably more importantly, in case someone is watching you plug in your combo! Also, I read some reviews where people say that this is difficult to install, but I found it very simple. I just used a power drill, a pocket knife, and a small file. Just to be clear, I think this is the first doorknob I've actually installed. Five stars!

The lock installs easily like a normal lock set. It feels solid, turning it feels smooth and gives you the impression of good quality. The codes are not hard to change/add. You can add code combinations with few numbers (i.e. a three digit code) or longer ones. I got the key option as a backup.

Seems very well made, easy to install. I'm still figuring it out, but I think this is the perfect lock for me; I'm planning to make a custom door arrangement and was wanting a lock for an extra wide door, but these door knobs are just a little longer than any knobs I've had before, so it will probably be perfect for my use.

My only suggestion is that the instruction sheet could possibly be written to be a little more idiot proof... but that's just me.

EDITS-
-Though nice and easy to grip the nice rubbery knobs, the knob diameter is a little too big (and I have big hands!); it comes too close to the door frame, kind of squishing my fingers sometimes when I open the door from outside in a hurry with my hands full.

-There's no easy way to just try to turn the knob from inside to quickly verify that it is locked; the inside knob ALWAYS opens the door regardless of if it's locked or not.

-Customer service is excellant; I misunderstood the instructions programming it a couple times, and chatting on their website, they helped me figure it out.

-The large rubber coated easy grip door knobs for those who otherwise have trouble gripping and turning a doorknob for some reason.

-I'm still very happy with it and will likely buy another soon.