Yep they are better than a standard can opener. I have opened everything from an oil can to a coffee can, soups and such with ease. Actually "faster" than an electric when ya get used to em !
Best thing money can buy !
Make sure ya get the GI version as in the pic vs the aftermarket clone at camping stores from cooligan etc etc .
Surplus stores have em in small brown paper wrappers for a dollar ea.
Key chain, vehicles, tackle box, kitchen drawer etc is a good spot for a few. I have same one for over 30 years now and it is just as functional as the day I got it in a C-Rat Box......
Get one or 12 BD !
Those little bugger litter the ground in places at A.P. Hill. I've got a few tucked away (picked them up when hunting there).