To tell how well a bike lock is, the simple rule is how thick the locks are. This one is very sturdy and hard to break. It's much stronger than anything and very well worth
The lock is more secure than anything you are likely to attach it too short of a bank vault. No one, and I mean no one, is going to pick this thing or cut it with anything less than hydraulically operated bolt cutters. It would be easier to cut the bike rack and then you would still have to figure out how to get this thing off the bike frame.
This thing is sturdy! I love the roomy U area and the extra cable, I feel like my bike is very secure now. The bar is heavy, and the cable is very thick. Very satisfied.
The mechanism itself seems pretty rickety, and it takes practice to get the key to go in smoothly. But it works, and is incredibly robust.
It's heavy, but it's very durable. It also looks fantastic.