The print quality is for my application (several times a day "class sets" of 30+ pages print) also absolutely fine. My students complain otherwise very quickly if the highlighter absorbs the toner or the like happens. With this product, the result is flawless even in favorable paper from discounters. I hear no complaints and at the cost I'm just at 0.4 cents per page, while the original toner by higher price and fewer printed pages about six times (!) reaches value.
Thus, even if a time should be "rotten egg" under the Printer Express toners (which previously did not exist) must happen a lot before you make a bad cut over the original toners. Strong buy recommendation!