I am using the COne inks with a 2400 and I agree than the blacks from Epson are deeper but I have had issues with the Epson ABW driver regarding neutrality and also with matching screen tonality. With the QTR and Cone inks I get smoother tonal transitions and more predictable prints. Deeper black would be good but so far the tradeoff is good. I am looking for a used 4000 to convert to the Cone inks as the carts on the 4000 are too small for good economy. Has anyone uses the MIS inks with the 4000?