I bought them 2 of each color and a week later my 8600 stopped working a call to see if anything could be done. It would print from computer but I had no panel lit up.I bought an 8720 from hp and bought 2 of each. I sent the other back for credit to my card.
New printer prints good. HP was simply the cheaper option for someone on a fixed budget. Had to replace an earlier HP inkjet pro which failed 4 weeks after warranty was up. Wish I had had better choice $$.