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@edscoble
They're next to useless, the key is the word 'handcuff', designed to cuff your hand together on your back giving you very restrictive manoeuvre making it easier for the police to handle you.
but they still can be cut open with a bolt cutter in second, easy to snap if you twist it using the bike as leverage, etc. too much flaw to be used as a bicycle lock.
now as for the security rating, they're purely for instance and only certain tools has been used to try and cut those lock, but they didn't use bolt cutter or angle grinder otherwise it'll break within second, or minutes if you're lucky.
get a decent D-lock, the original design is still the best, and there's almost no weak point that make it easier for thieves to cut them.