We've used this product for a few months now. I would say it works better than I expected, as I was somewhat skeptical, but there are things that irritate.
The installation was pretty straight forwrard and the instructions suitable. Replaced existing door lock in about 20 minutes, with a screw driver being the only extra tool required. Another 10 minutes for programming it for everyone in the family. After installation I ran some tests and it recognized the trained finger consistently, and rejected untrained fingers.
Here are the things that could be better:
- The user interface for programming is pretty cumbersome. Granted you only do it every once in a blue moon, but still. In today's world a USB port and small PC app would actually be a much cheaper way of providing a good user interface.
- At times the unit thinks quite long before making a decision. If I hold my trained finger just right, I get a response in 1-2 seconds. But if I'm off, it can stay up to 15 before giving up. So now, if I don't succeed I just reset it (which means sliding the cover down/up) and try again.
- It would be nice to have a knob on the inside to tell it to stay in the unlocked position. This lock is always locked. After successful validation it will unlock for a short period and then fall back. So a quick trip to the garage to grab something means validation. On the flip-side, you never have to check whether the door was locked when you leave.
- The reader seems a bit sensitive to moisture. I can improve my validation rate significantly if I moisten my finger slightly.
- It wasn't totally obvious at first look that the lock actually has a keyed lock as well. The lock part is covered by a magnetic plate. That plate can only be removed using another magnet. No way to remove it with fingers only. That feature can be helpful if this is your only door to the house and the battery is empty (if you happen to have the key and magnet with you).
So in summary, it's not as convenient as a standard key lock, and I wouldn't replace it for security reasons or convenience reasons. However, if you have kids who have to come home after school, it can be a great solution. They don't have to take a key, no risk of kids losing the key, plus they think it's cool.
If you have a unique need where a standard key lock is problematic, this is a viable solution, and that makes putting up with the quirks worth it. Otherwise, stay with the old and proven low tech solution.