So, chain locks aren't the most secure in the world, but no bike lock really is. I think any of them can be broken without spending too much time on it. And, as a result, locks aren't the alpha and omega of security.

Many commuters use two locks; I do this, because I can't see my bike from the office. One is a U lock that goes around the frame and front wheel, while the cable lock, more like yours, wraps the frame and both wheels. It's more for show, I think. On the other hand, lots of commuters try to just park their bike in front of a window and make friends with whoever works on the other side of it, or to do something along those lines. Very lucky bike commuters get to bring their bikes inside with them, but I'm not one of those people.

I suddenly have two bikes; the new one it's the most secure of all, and it doesn't have a lock. It doesn't need one, because I never leave it outdoors unattended. That's not an option for commuting, which is why I still have the other bike ... but creative solutions can help keep your bike safe.