I have a bog standard Aldi razor and it does the job just fine. I don~t have much of a beard and only need a shave every few days so not too bothered with what I use.
I've got stupid sensitive skin and the hair grows in mad directions. I'd have very heavy growth after 24 hours without a shave (which is mad because I'm not a hairy chest/back guy). The price difference and quality of shave between DE shaving with proper kit and those rip off plastic contraptions is night and day though.