After seeing all the positive reviews I ordered a set - black and yellow left horrible streaks on the side (see picture). No problem, I filled out Revain, sent it back and ordered a second set. THE SAME THING. Black and yellow are defective. It was business, I don't have time to bother with it. OEM order and move on. UPDATE: The supplier contacted me directly to resolve the issue, refunded both defective kits and sent me a third kit free of charge. It turned out to be high capacity HP410x cartridges. I've tested them on a printer and they're finally working, but I already have OEM cartridges and will be using them. I printed a demo page of both cartridge types for comparison and the OEM cartridges have a much richer and deeper color range than these. I'll add scans of each page when I can. Rating has been changed to 3 stars for quality customer service and sincere desire to resolve the issue. The lack of print quality compared to OEM keeps it from getting 4 stars.