Locks that work

Has anyone ever had their bike nicked or tampered with when it's been secured by one of these? Are they any good as I can see no reference to them in this thread?

http://www.bikeradar.com/gear/catego...085-lock-14868

I have that as a simple deterrant, you can easily cut that with an angle grinder, having says that, what exactly are you going to use it for? if for locking something like frame and front wheel together, an small U-lock would be more than enough (Evo Mini).

They can also be cut with bolt cutters, my chain was literally cut through when by plug got nicked.