I use the Kryptoflex cables by Kryptonite. As you said it is easy to cut cables, so I don't think for a moment it is a theft deterent because of its strength. I use it in conjunction with my two Kyrptonite U locks as a visual tool. It should say this bike has too many locks and isnt worth stealing, there are easier pickins somewhere else. So far I have been lucky but as exile says, if they want it they are going to get it.