Today I just went through the 4th can opener from walmart in a year. I'm not even using them a lot, they just get weak at the plastic handle and either break or strip.
I purposly went and bought the most expensive POS they offered. Now I'm going to look for either a solid steel opener from another store, or start using an old school can opener off a swiss army knife.
I just want to chunk this dang thing at the store and ask why they don't offer stuff that's made in America or just up the price to $20 for a decent quality one.
If you think you're ready for TEOTWAWKI and you got a can opener from China-Mart, then you should get out and buy a new one, or get good at using a knife to cut a can lid.