Except for the fact that there are no real world reports of bikes actually being stolen using their methods. It's all hype, really.

Check out this thread on the subject. It'll give you some insight into the company making the wild claims and people's real life experiences with high end locks. https://www.bikeforums.net/general-cycling-discussion/315837-have-you-had-bike-stolen-while-using-high-end-lock-please-give-info.html

Just thought I'd weigh in on this one as the resident paramedic from NYC. If for some odd reason a patient was hurt badly enough for this to be an issue, there would already be an engine on scene with extrication tools that are handy for this sort of thing. If, for instance, a jaws of life tool was not of any help, then the next call would be to ESU. ESU are pretty creative when it comes to these challenges. It does remind me though of the fact that titanium wedding bands are a generally a bad idea. The ring cutters we use can't cut through them. This has lead to amputations of fingers resulting from injuries as mild as sprains and fractures. But the waist mounted bike lock doesn't worry me too much, as the fit will still leave some room for the trunk of one's body to swell. Though ya might not want to wear such a lock while engaged in the Nathan's hotdog eating contest.

at my old apartment i locked my bike in a forbidden place and my super cut it off, not knowing it was mine. it was a kryptonite mini, the orange one. he said it was extraordinarily difficult to cut and the only thing that worked was a grinder.

since i cant imagine anyone using a grinder on a public street in the daytime, i feel confident with a mini almost everywhere. at night i use the NY fahgeddaboudit yellow U. i also have a NY noose, but i feel like it is inferior to the fahgedtabboudit U, which appears to me to be truly indestructible.

If you can not imagine using power tools in the day time, in public, during the morning rush hour, you have not seen the video where a guy uses a power tool to jack his own bike in public with a power tool.

Also in the same video he is trying to chisel his chain (lock), and some one stops and aids him, tells him it is easier to chisel at the lock rather than the chain.

i have seen that, i just have a very terrible imagination.

Carry $12 steel chain length from hardware store.

Wrap steel chain length around 42" bolt cutter handles.

Padlock chain together.

Put breaker bar in chain.

Twist breaker bar. Repeatedly.

Any questions?

(Oh, by the way, this method adds extra leverage based on the length of the breaker bar to the pivot point, meaning you get an even more powerful bolt cutter)

Don't mean to hijack, but does anyone have experience with these Onguard locks? I got this one for free.

I have that lock. No issues with it so far, 6 months in.