I wouldnt use a cable lock alone unless its a beefy one. I saw a guy pull a hand-held set of wirecutters out of his coat pocket and snip one of those off, I'd guess it was 1/4" steel cable. An armed guard scared him off, but if he wasn't taking his sweet time he would have been gone. I was stupid with disbelief because this was downtown chicago at lunch time, but I guess it happens.