What is the best lock?

Just thought I should share this. At east drinks last wednesday some people unconnected to us forumengers had their bikes attempted to be stolen by a couple of thieving little scumbag teenagers who live around the corner. Pyjamas spotted something amiss, yelled out and they ran off. The bikes in question were locked with an one of those ABUS ball-o-fix type locks.

They cut straight through it in seconds with a pair of shitty old bolt cutters, and on inspection of the lock afterwards it was clear what had happened. Do not buy one of these locks or trust your bike with it, they look tough but in reality are no better than any old rubbish cable.

WTF is an ABUS ball-o-fix? Could you give us the proper name or a pic please? Ta.