There is absolutely nothing wrong with the product. I have purchased it elsewhere before. What I am confused about is the order. I thought I was ordering a compatable set of toners which included a black cartridge, which I needed. That is not what I got. I had thought to order two black cartridges, but, with this set, I didn't need the separate cartridge. Was I surprised when I opened the order and did not have the extra black cartridge.
This is not to say that the ease of ordering and the rapidity in which it was delivered was in any way off. It was top notch. I will try again at a later time.