obviously anything can be busted apart but ive always gathered those locks have done a pretty solid job of deterring, i had a bike stripped clean by pretty resourceful crims but they couldnt get the rensho-u lock-and bike hoop thing apart but they did manage to bring 3 allen keys and 14mm spanner along
I've used an angle grinder on a d-lock before. It takes much longer than 8 seconds and causes enough noise to kill a small child.
Man, such a nice bike. Makes me not want to get a nice bikeKents.