For me it’s toner for printers: I have a Brother laser printer at home that is not heavily used but at least once a week. I thought I’d save some money when I bought some cheap ass toner from Amazon that cost about half of what a original Brother toner costs and promised something like double the capacity.
Oh boy… I had the worst mildly infuriating two years of printing you could imagine: always disappointed of the printing quality but not THAT disappointed to replace this shitty but still at 2/3 capacity toner. I paid money for that toner so I’d squeeze every last page of shitty quality prints out of this fucking toner!
Last week I gave up and bought an original Brother toner and it’s a bliss. 🙄