The auto-lock started wearing out within a day or two ...
586945
The auto-lock started wearing out within a day or two of just testing the tape.  If it goes, the tape is junk.  Otherwise tape feels cheaply made, DO NOT BUY.
3588832
I've owned on of these Schlage electronic locks for 4 years. It was purchased for a small professional office so we could do away with keys. The lock worked fine in the beginning, but the battery life became increasingly poor, and after a year or so required a battery change about every month. I'm using high quality 9v batteries, even tried expensive lithium batteries. Also the low battery warning got shorter, to the point that it just fails with no warning. Changing the battery is pretty cumbersome as you have to remove the back plate with a screwdriver and then hold on to the front with one hand so it doesn't fall off while you change the battery with your other hand. Could be an easier process, especially since it needs to be done so often.

In very cold weather, the lock behaves erratically. On cold mornings, like we've had recently, the lock codes don't work, and you have to use a key to override the lock. I had to put a key lock box on the outside of the building for times when the lock doesn't work, which is now all too frequently.

I really wanted to love this product. It's a great convenience when it works, but the shortcomings now outweigh the benefits and I am now looking for another product.
4276476
It's okay but only worked for a couple of days.
1632609
Looked OK at first.  It installed easily and fits like the failed original it replaced.
After I got it installed, I noticed the auto-down feature doesn't work.  The switch, labeled auto, doesn't have an auto position to it despite saying it on the switch.  Normally you push past the initial resistance in the switch, hear a click, and the drivers side window goes down all the way on it's own.
This switch won't do it.  I was disappointed, but to me that's not a big enough deal to tear the door panel back off and return, etc...

About a month in, the lock/unlock function started becoming difficult to activate.
I'm at the point where I'm pressing it 2-3 times just to lock or unlock the doors.  Seems like going from lock to unlock, back to lock will cause it to work.  Something broken and loose perhaps.  Engineered to OEM specs would mean cheap brittle plastic like my dash  LOL.
2948178
Few days after I started using this product, the lock has been cracked too early
346303
Lock and cable seems solid enough but the cheap plastic bracket for clipping it onto your bike frame broke within 2 days.
354533
After about 2 years of only occasional use, the front threaded section came loose and would no longer screw into the rest of the monocular securely. I could basically pull it in and out - no thread action. Now, a year+ later, the other end has done the same thing. And this is with very minor/occasional/brief use. That is defined in my context as an average of once a week for a few minutes at a time of casual use. This is a piece of junk. Do NOT buy.
3413853
Use this for one day, Camera was not over weight, and the top tier lock started slipping.  I can barely keep it from sliding down now.
496106
EDIT: Two days after I wrote the 2 star review below, my bike was ALMOST stolen. The lock showed evidence of being cut with a saw in three separate locations but the perpetrator obviously gave up before getting all the way through. Despite any inconvenience with the lock sticking, I'm very grateful I had this lock on my bike. I just ordered the same lock again as a replacement.

Original review:
After about of month of multi-daily use, the locking mechanism gets stuck about 50% of the time. It opens after jiggling the key a few times, but is inconsistent.
4778301
After just a few days it wouldn't stay locked. It's useless now since it opens and won't stay on.
1297577
Broke within 3 days of using it; the plastic spindle unto which the lock mechanism rests broke upon trying to lock the door. Bought myself a 30$ lock from home depot, all metallic, lesson learned.
2880860
Loved this lock/handle when it was working.  Easy to program and use.  Unfortunately ours had the issue of not pulling the bolt in after only 1 -1/2 weeks use.  It locked us out of the house first the locked us in the next day!!! Thankfully we have several doors to use.  Sadly sent it back and went a different route.
4379678
I bought five of these locks in 2012.  Two of them failed in the last week.  On one, the electronics stopped working and so the lock no longer locks.  On the other, there was a mechanical failure and it is now locked and cannot be opened.  I'm going to have to take it apart to open the door.

A lock should last a LOT longer than two years.  Obviously, these are poorly made.  I emailed Master Lock and they have not replied.
2312900
This lock worked perfect until one day my combination, that I set up myself, no longer worked.  I used this lock on my locker at work where I stored my purse and car keys.  I had to have maintenance come and cut the lock off and someone bring me a new lock.
158991
I bought this after my original badge holder broke ( after 2 years of use) and attached the new Keylion one this Monday morning before going to work. I badged into the elevator , then badged into the office and the metal clip broke off.

I would suggest spending a few extra dollars and getting something that doesn't break after 10 minutes.
1386864
This lock and chain are vey secure.  Unfortunately, the lock is frequently too secure, preventing me from opening it.  The keys to this lock wear quickly, making it progressively more difficult to open the lock without lots of jiggling and swearing.  After about 45 days of everyday use, the keys become unreliable.  And after 60 days, faghettaboudit!  I've gone through the 3 keys provided with the lock and I'm really frustrated.
1613646
The lock starts sticking after about a years worth of use. Then you really need to fenagle the key in order for it to work.