All locks are vulnerable to certain attacks. The video a few posts above show a guy with 3ft or more bolt croppers cutting through a really cheap roller lock. Also, they're not the regular bolt croppers that normally have straight jaws. The ones he had won't work on hard chains. Have a look on Ebay to see how long it takes to find that type of cropper. He chose them very carefully, as a professional would.
Who do you see walking around the town centre with such a device? How would they conceal it? I have some 3ft bolt croppers. They weigh 5kg- not the sort of thing you can carry around. My arms were aching just bringing them in from the garage to weigh them. Sure, it's no problem if they're professional thieves waiting in a car, but then they're just as likely to have every tool they need to defeat any lock.
You're riding a bicycle. It's very inconvenient to carry around security devices that weigh several KG. By all means carry 3 gold certified locks with you if it makes you feel secure. I'd rather enjoy the freedom of riding a light-weight bike.
As I said, you have to find your own balance between risk and convenience.
Who do you see walking around the town centre with such a device? How would they conceal it? I have some 3ft bolt croppers. They weigh 5kg- not the sort of thing you can carry around. My arms were aching just bringing them in from the garage to weigh them. Sure, it's no problem if they're professional thieves waiting in a car, but then they're just as likely to have every tool they need to defeat any lock.
You're riding a bicycle. It's very inconvenient to carry around security devices that weigh several KG. By all means carry 3 gold certified locks with you if it makes you feel secure. I'd rather enjoy the freedom of riding a light-weight bike.
As I said, you have to find your own balance between risk and convenience.