Where are you locking the bike? For how long? How often? What is bike theft like in that area? You have to answer these questions. You might find that locking up in the same place all day long is not a good idea, no matter what lock you have. Here in NYC, crime has gone way down, but bike theft has not. It's pretty bad. I'm lucky that my employer lets me bring my bike inside. I don't even carry a lock!