I waited a month to replace a cartridge during a busy printing period. I was worried because it was the first time. It was accepted as an HP cartridge and worked and printed great. No issues, unlike some others who complained that it wasn't an HP cartridge or wouldn't actually print. I use an HP Envy 5055 and, as I mentioned, my wife does a lot of typing on occasion. She was able to easily replace the cartridge (Plus) and finish printing. The price was also better than the original cartridges, which I think was the main reason I gave it a try.