As much as I am elated by the fact that I can get a cartridge with a guarantee, I am more impressed by the fact that it comes with a larger quantity of toner and ink which is essential in printing large amount of pages. Thais gives the ability to print more pages than I normally would have been able to print with a different cartridge. Another important factor that I have been able to enjoy with the Canon R94-7002-250 New Compatible Black Cartridge Toner for EP-52 is the fact that I can use it on a variety of printers without necessarily having to worry about compatibility issues. This has enabled me to save on costs given the fact that the extra amount of ink that it comes with cannot be found with other cartridges.