Assume the 3 rolls are rolls of 30 meter length, 44" wide. Roughly 100 M2, ink consumption 1 to 1.5 liter at $ 0.30 per ML is $ 300-450 a month with Epson inks. 9 months passed so in between $ 2700-4050 in Epson ink costs. At gallons the Image Specialists ink is about $ 0.10 per ML, so the price difference could be in your pocket if we do not count extra refillable carts costs; $ 1800-2700. I guess that is not enough to cover the costs of 2 head replacements. That leaves Image Specialists to complain to as I doubt Epson will do anything about it. The members here are already overloaded with complaints about x9x0 Epson printers with normal OEM ink :-) See the longest running thread in this forum.
Met vriendelijke groet, Ernsthttp://www.pigment-print.com/spectralplots/spectrumviz_1.htm
December 2012, 500+ inkjet media white spectral plots.