"I bought this to replace an aging lock that was giving problems, thinking that Yale reputation would be good. Fitted the lock (which needed a larger aperture than the previous one) but when testing it, I locked the door and it wouldn't unlock! After a few attempts it did unlock, so I removed the lock and tested out of the door. The key would frequently start to turn then fail to open the lock (turning to lock it was never a problem).
I returned the lock to branch where they happily replaced it - but I tested it in-store and had exactly the same problem.
A trip home to retrieve everything from the pack, and back to replace it with a Union model - that tested OK, and thankfully fitted the new aperture so all was well in the end, but NOT with this model."