I ordered these cartridges for my HP printer. I thought it was a good price for two cartridges and was happy with the purchase when I installed the first cartridge. Printed normally, without streaks and clean sheets. it also took quite a long time, unfortunately I don't know exactly how many sheets. Then it was time to replace the cartridge, so I put in a second one and had nothing but a full sheet of black ink when I tried to print something. This happened to everything I wanted to print, so I had to remove it, put the old one in, and order a new one. I was disappointed and commented on this in my first review, support contacted me and offered to replace the product. I had already ordered a new cartridge and didn't need a replacement as they lasted so long they offered me a refund. I would definitely recommend this product and this company, they stand by their product and guarantee any issues will be fixed.