I suppose the refill quality is directly proportional to how reputable the service company is.
My Samsung's Yellow toner cartridge was refilled a few years ago by a small business, where the guy installed a 'reset' chip.
Sadly, the cartridge would not work, giving "unknown or invalid product" errors.
I now prefer to spend a bit more and buy new - more cost but less hassles.
The strange part is, if you calculate (in our currency), a new toner costs around R1000-R1200 minimum.
Yet a M/F CMYK can be bought, with toner installed, for around R3500-R4500....
