This is a BS statement! Actually ANY lock can be defeated in a matter of seconds with the proper tools and a professional by either picking or mechanical force...even the "fame" Krypto NY U's and chain locks and other "Gold" locks.

The question becomes, will the thief have the proper tools when he comes across your bike. If you have two different kinds of locks then the thief will have to have two different kinds of tools. If a thief is smart and notices a high value bike parked in the same place all the time, they simply will see what kind of lock or locks your using and come back later with the right tools for the job.

There is actually a lock picking contest that takes place every year where a few professional locksmiths participate to see who can pick a variety of different locks the fastest: http://www.securitytribe.com/~doc/lpcon4/ Anyone can learn how to pick locks with practice, in fact the damm internet provides the general public with video and instructions on how to pick a variety locks.

This is why I have kept stressing over and over and over on this post that if your worried about having your bike stolen then BUY A USED OR NEW ELCHEAPO and ride it instead to work or school or shopping.