I recently locked my bike at the bike rack outiside a well known store in Honolulu. I locked my back wheel Sheldon Brown style with an Onguard Pitbull Mini lock and had the front wheel secured with the 4' cable from the mini. I was in the store for only 5 minutes. When I came out, I discovered the cable had been cleanly cut (bolt cutters?), and the front wheel quick release and u-brake had been undone. I was lucky that my bike was not stolen and I was able to ride home. The point is, any cable and lock can be defeated and only buys you time. At the very least, a cable lock or cable should only be used for the most minimal, if there is such a thing, theft situations. Good luck out there, and watch your bike at all times.