There are portable cutters available now that can go through all of these in seconds. They are meant for rescue/construction workers to cut the bars in reinforced concrete beams (rebar).
So none of these locks stand a chance if it's a pro-thief, you are only stopping the amateurs.
Well yeah, that's a problem but really there is nothing to stop professional thieves - at the tail end they can just point a gun to your head and have you hand over the key.
I am not really concerned with professionals though because it is a simple matter of sending them to prison for a long enough time - say 30 years - so that the cost outweighs the benefit. That is something the politicians should look into, as they all want to be hard on crime.
The danger is those who steal a bike because they need to get home because they are drunk or those who just deface them. Tougher sentences will not prevent them, because they don't consider all the ramifications in the first place.
Maybe rigging the bike to give an electric jolt if they take it? Not enough to be damaging, but enough to make them stay away?
So none of these locks stand a chance if it's a pro-thief, you are only stopping the amateurs.
So then you pay the deductable on your renters/homeowners insurance and get a new bike. Hardly a crisis in the one in a million chance that a professional bike thief wants your bike.
So none of these locks stand a chance if it's a pro-thief, you are only stopping the amateurs.