Hi Ian. I have loaded some Marrutt ink into my Epson 7880. I bought the printer cheaply as it was completely blocked up and, once I got it working have used it to explore how to make ICC printer profiles. I have used two other inks: InkTec and Cone Colour from InkJetMall. Because I was experimenting along the way, I don't have any really relevant direct comparisons between the three different ink sets except to say that the gamut volume of ICC profiles generated using InkTec and Marrutt inks were noticeably larger than the gamut volumes of profiles made using Cone Colour ink. There were slight variations with each set of ink when using different numbers of patches, patch sizes and numerous variations in the switches available in Argyll software for producing printer profiles. However, as you will see from comments on other parts of this site, the real test is if the prints please your eye not distracting numbers like gamut volume. As a standard print I have been using the set from DataColor and the differences in print results from all three ink sets are at worst subtle. I haven't done as much printing with the Marrutt ink as with the other two inks and I expect that I will stay with it while its price remains competitive. That said, the InkTec ink is just as good and even cheaper. I expect that the Cone ink is better quality and certainly more expensive for both ink and shipping (to Australia where I live). I hope this helps. Rob