I've got one of these and am yet to find something I can't lock my bike to securely with it. (My keys look different to the ones in the picture, but I'm pretty sure that other than that it's the same one - not about to run down to the garage and check.) The website does recomend it as being a lock for low-medium crime areas, but my LBS recomended it as being fine for London. My insurance company also rates it as a lock good enough for bikes valued up to £1500 (US$2700 or so), for what that's worth.
Drink coffee and do stupid things faster with more energy.