I guess it also depends on how it will be used. Mine would be used to lock up at the library and gym and farmers market. These tend to be pretty high theft areas. But I'd be there during the day and for an hour at a time max. There's a great YouTube video where a guy tests a half dozen or so locks from Amazon. His tools he uses to "steal" the bike range from "hard yank" to Cutting wheel. Not surprisingly, my lock was broken with a hard yank. Since I'm not leaving it overnight I'm not terribly worried about our local bike thieves whipping out a diamond cutting wheel. I know who steels the bikes and if they had a nice power tool like a Sawzal, they wpuld just trade it for meth rather than use it to steel a folding bike.