I've had my bike stolen before, like many living in London, so I'm not taking any chances when locking up my bike. I purchased this lock combination and another Kryptonite mini lock. It's a good lock, does the job very well so far. I use the big grey lock to tie-up the back tyre and frame, whilst the Flex cable goes around the front wheel, helmet and saddle (knot style on the saddle, which makes the most of its length!). This is where the small Kryptonite comes in, grasping the cable and the frame again to the bike stand/railing. They say two locks are better than one. I say in London, three locks (counting the flex cable) are a necessity if you own a nice bike and are proud of it. However, I wouldn't trust any locks if you're thinking of leaving a good bike outside overnight, there are too many desperate teenagers making a living out of bike theft!!