Bests & Worsts Reviews from Amazon

Length of ownership: over two years # times used: several hundred I rode my bike daily to the TX Med Center in Houston and would lock my bike outside one of the busiest public hospitals. Sometimes I left my bike in areas with very little security surveillance and several times I left it overnight. I am happy to report that my bike was never stolen or tampered with. This is a formidable looking lock, which I'm guessing is a theft-deterrent in itself. I like the heavy-duty chain enclosed by the thick black sleeve that says "KRYPTONITE." The heavy-duty locking mechanism is tuned nicely so that there is no doubt whether it is locked or unlocked. The extra key is nice to have as a backup, I even registered mine so that I can order more in the future if I lose one. I have used this lock over and over again and have exposed it extreme heat and humidity as well as torrential rainfall and yet it still seems to work as well as when it was brand new. I did my research before buying a bike lock and this is the type and brand that I decided upon; obviously I am happy with my decision. For maximum security I would recommend using two different types of locks, such as a chain (like this one) and a solid bar. That way, a bike thief will have to use two different tools to get to your bike. That being said, most of the time I had no worries about securing my bike with this chain only.