Europe and China region P400 users can print with their choice of inks. We just designed a new P400 cartridge with chips that will auto-reset on the North American region P400. You can now print with ConeColor® Pro inks to get superior dMax to EPSON®, or with Piezography® monochrome inks to get better black & white than EPSON®, or with InkThrift® inks if what you need to print economically does not need to stand the test of time like ConeColor, Piezography, and EPSON® inks will. Refrain from ever updating firmware on any of these North American region printers.
Cone Editions Press, the developers of Piezography, now has an inexpensive, on-line-print-ordering system that allows you to upload your own images and produce 8.5x11 sample Piezography prints with your choice of ink tone and paper. Cone Editions Press will use Piezography Pro inks for most tones but are still offering K7 samples using Carbon, Selenium K7, and Special Edition K7. Please check out their sample printing service by clicking here.
You can read more about the Piezography Pro system by clicking here, and read more about the differences between Piezography Pro and Piezography K7 ink sets by clicking here