As to the broken arm comments... based on how you fall, some wrist guards will transfer the energy to your arm and if it is strong enough, it will break.
It's the same as helmets. They will help and often will save, but slam your helmeted head in to a tree at 50 mph and it will not do shit, except save you from a laceration or two. Drop a cliff on to your wrist and your wrist may survive... but your arm will absorb the impact and break.
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