My HP M452 color duplex laser printer developed ugly vertical black bands on all prints. Nothing I tried would eliminate this problem. Finally, I decided to replace the OEM black cartridge with a genuine HP branded cartridge and the problem went away.
no review, as haven't used yet. (The blue replaces one that is low because an article printed had half the pages solid blue)except price -- I think outrageous
The new toner packaging is much neater than previous generations where you had to pull a tab or give the cartridge a good shake before use. Prints came out perfect.