Good solid deterrent as proven by numerous tests. 2 very small criticisms, 1, the packaging was an absolute pig to to open and 2, some dayglo covering on the lock to make it more visible would be a great idea. The one I bought was for my motorbike. I'm going to buy another for my push bike. Great lock! Btw I've made mine more visible with some electrical earth tape, not pretty but effective. See pic.