having purchased these E502-XL cartridges in good faith i was buying a quality product, but after installing them it was brought to my attention (1) the cartridges were only 50% filled with ink,(hence the price comparison to the Epson E502XL recommended cartridges), and (2) the chipset on the cartridges, does not have the correct compatibility for my Epson XP-5105 printer either! so i have 1x unit saying it registers and 3 x 50% filled others that the printer does not recognise. i am very disappointed after being sold the item under the premise that it was legitimate. please contact printer ink