as a ex epson rep I need to come to their defense. 1. Yes there are 4 wells and yes you need all colors with ink to print. But when you are out of one color like with your HP you do not need to throw the cartridge away with other colors still in in cartridge as you do with HP. Average color with Epson $13. average cartridge HP $35.00. HP inks are a dye ink. I would not like to buy a shirt made with Dye ink. yes it looks good to you today but when your customers wash it ten times they will not like it. Try it next to a shirt printed with epson ink and then you will understand.