I noted while visiting their web site that Kryptonite offers NO "bike theft insurance" with any of their cable locks. That tells me that they do not consider any cable lock to be even close in security to a U lock or heavy duty chain lock.

Even if difficult to collect on for a bike stolen while using a Kryptonite U or chain lock the fact that insurance is not even offered for their cable locks says a lot about what they consider the security level of them.