I used a Kryptonite New York lock for over a year and was quite impressed with it. Unfortunately, I absent-mindedly left it unlocked on the rack as I was leaving work one day, and it was gone when I returned the following day. I replaced it with an On-Guard Bulldog lock because they were on sale at Performance Bike, and I have been disappointed with it. Although it has kept my bike from being stolen, the lock periodically has jammed up, making it impossible to use it. I've had to stash my bike in a storage room on several occasions due to that problem. I was able to free the lock by squirting lubricant inside it, but I don't trust it anymore. The lock is kept locked to covered rack at work, so it is never exposed to rain. I am hoping that Performance will let me exchange it for another Kryptonite NY lock.