I looked pretty heavily at that lock. I still haven't seen any prices, but I finally got around to looking at the weights, hoping for something amazing. My small u-lock, which I've yet to encounter a place where I couldn't use it to secure my frame, weighs as much or less than the 670 grams (about 1.5 pounds) of their "heavy" lock. The 1.3 kg (nearly 3 pounds) they're using on that chart must be for a full sized U-lock. Of course, cable lock users will scoff even more at those weights. Anyhow, after seeing the weights, the general length and awkwardness of the design (reduced packability) really turned me off.

As far as cable locks go, I work at a bike shop at UT Arlington and we've seen lots of cut cables. We have some abused Park Tool cable and housing cutters we keep around for utility purposes. We keep a few cable locks on hand just to show people how easily we can cut through them. The thin ones can be cut in one snip. I think a thicker one took me three full motions to get through. Another friend almost had their bike stolen outside of a friend's apartment. She had left it there and they weren't comfortable with just the cable lock she left, so they threw a U-lock on there for the night. The next morning, the cable had been simply PULLED from where it was crimped into the lock mechanism. Of course, the bike was still there because it was also secured with a U-lock. That defeated cable lock also hangs in the bike shop.