I really wish that when they made the XL Cartridges that all the colors were XL High Yield not just the Black in the Combo 4/Pack by HP Because the color's run out first and you still have black left. All in all it's a good idea and you can get more copy's if you only print in black! I have been using the XL Cartridges for my HP Office Jet Pro for over a year now and still have black left over. It would be nice if they all ran out at the same time so you wouldn't be wasting Ink thinking that they were all out. If they made all the colors in XL I would buy them.
For true colors and the deepest blackI always stick with HP genuine ink cartridges.I have tried others and they aren't as strong and run out quicker. When people ask I tell them I go to Staples and get the"Real thing".