I know a guy who snapped something like a pin which was stopping the blade for going backwards after 180°, he simply pressed it to cut through cardboard and that vacuum seal plastic package and... it didn't go so well. That knife apparently cost him around 30€ online, with another 7€ for shipping but I don't remember the brand, I think it said K25 on it, it had glass breaker at the bottom too. But that is around the same price I paid for Cold Steel Drop Forged Hunter, and ironically I carried Drop Forged Hunter that day and I cut through that package without an issue.
I was never fond of folders as fixed blades are stronger, simpler and faster to use and easier to maintain. But I do admit that folders do have the charm of their own.
There's so many things that can go wrong with folders as there are moving parts, but that also makes you appreciate a well made folder even more.