The HP 950/951 Combination Ink package is probably the most cost effective ink "set" that I have seen in a very long time. I actually used the "Starter Set" for over six months and just recently installed my first "User" Set. With my normal usage I would expect that it might even last for an entire year I got a "deal with the Buy 1- Get the second for 1/2 price so this made it a REALLY GOOD deal. I may not have to buy ink until 2017!! BTW the colors are really great too!!