i'm about to go for cycle touring, and i'm carrying my recent purchase of an abus granit x-plus 54/300mm with me. any feedback so far about it?

i'm lost, because from what i read so far, that bolt cutters should have a hard time cutting through the square shackle it has - did i understand wrongly? i also got the 300mm version, thinking that the shorter 230mm version may somewhat limit what and where i may be able to lock to....