What brute force would destroy one of them? Do you think you could break it with a crow bar? They are very difficult to even cut with a grinder, though you can do it given long enough.
The website stated that the chain cannot be cut with boltcutters and even an angle grinder would have problems, whereby the cutting disk would get mangled. With time and determination, however, the chain would get cut. Obviously though, if this is going on right outside in my driveway, I would definitely notice.
I'm actually leaning towards the Oxford Hardcore XL chain and padlock (for £50). Its a lot cheaper and it won the supertest in Ride magazine.
I'll also go with Datatag and a Anchor bolt.
But it also has a binbag for a fairing and a luggage rack made out of wood, so I don't feel I need a chain.
But they used to do the same demo at the bike shows, I turned up at their stall, cut a Hardcore in about 40 seconds despite being incredibly puny. The only real criticism you can level at them is that some of the locks in their vids and in Captain Cropper's are mis-identified, no malice in it I think but there's a vid of a cheap cable lock that's wrongly ID'd as a more expensive Abus, and a Kryptonite chain that's got the model name wrong. But that's pretty trivial, the point of the demos stand.