We purchased the hp printer that takes this type of ink 2 weeks ago and it has been used daily but we are still using the cartridges that came with the new printer. The printer we had before was costing us over $100.00 a month just for ink.
Only buy this ink if you want the very best! Why buy an expensive copier and skimp on cheap ink cartridges which give you poor appearing printed copies while running the chance of damage to your printer ! Just stick with the best ink on the market - you won't be sorry.