Breaking attempts did not have to resist.
But freezing at temperatures below zero is absolutely out of the question. For one week I had my bike leave at the close space, until it was time warmer, virtually unimaginable when that happens once in inopportune situations / locations. Who does not live in Germany, and never experienced temperatures below freezing, the lock can safely use quite well. My 13 year old Trelock cops that until today still works, that's never happened to freezing. And that does not even have a protective slide in front of the castle.
It also hooked easily at temperatures above zero, although it is only 2 months old.
My advice, therefore, to buy another castle.