Locks that work

Why do you think OnGuard has a lower quality steel, because in practice it is not true, and the rest is classic stupid Kryptonite Power marketing.

http://gizmodo.com/5922074/the-best-bike-lock

Every good U-Lock must have double locking, there is no reason that people buy any Kryptonite U-Lock with a single U-shackle locking mechanism.

http://min.us/mpewKuzjic9HK

http://min.us/mbpWOKldAOq4pw

Today people have choise, because Kryptonite is not the only company that produces good U-Lock.

Abus

Trelock

OnGuard/Magnum

Giant SureLock Protector(X2P tag rebranded OnGuard Bulldog Series, X4P tag rebranded OnGuard Pitbull Series)

http://www.giant-bicycles.com/en-us/gear/bikegear/locks/514/

Zefal U-Lock( rebranded OnGuard Bulldog Series)

http://www.zefal.com/en/21-locks

Here's a great example Kryptonite Power Marketing in action, weak or inadequate bolt cuters vs Kryptonite Evolution 4 Series= Kryptonite is unbeatable.;)

http://youtu.be/su1gjz7bXZM