I talked to one of the guys from the company who sells the AQX inks today and he seems like a good, knowledgeable guy. He says they do a lot of research and testing before releasing their inks. He also said that they are about to release the two missing inks for the i9900 (red and green), but that they are going to test them intensively first. Another project they are working on is a paper which is especially formulated to work with their inks.
Anyway, I'll check them out and let you know. I paid $8.50 for 6 cartridges,toolittle to not be worth a try.