With my HP Desjekt 3070 I have to be cleaned 1-2 times the print head and then print my HP as usual. In the color I could not tell the difference from the original color. Have been the black cartridge 3x refilled and colors 1x.
The supplied pair of gloves are for filling rather disturbing. The gimlet for my HP 364 cartridges superfluous because the filling also works as easy. I recommend latex gloves because I've eingesaut me every time when cleaning the syringes and the color hard goes away from the skin.
Here's a message to all printer manufacturers: I'd rather you would again make the printers and not on the color. You're wasting resources and for responsible of unnecessary pollution. All this so that you have more money in your pocket.