The printer acknowledges the use of this alternative toner with "incompatible toner" Although he still prints, but only with 2 pages per minute. (It is also the manual to the error message) After about 50 sheets of the color used smeared horribly, thick blobs on the printouts. When cleaning the drum I saw the problem: Everywhere toner !! Printer filthy. But only with this one color. I took this out and toner immediately given for recycling. Never again Ultimate Office !!!