Cable looks good. Length allows to connect front wheel, seat, rear wheel to the U-lock. Flexible enough to fold 2 times in circe and put in backpack. Used in +5 C for 15 mins. Dont know what happens in winter during - 20 C degrees, I estimate that metal wire will get very stiff, because my previous thin wire did that in winter when I left it outside for 2-3 hours.
For stress tests, check articles on google or youtube. Havent tested myself, nor tested by burglars (I hope never will).