Not much to say on these ink carts, IMHO expensive and they do not last nearly as long as they should or as alluded to in company specs. Not Best Buy fault since it is the proper carts for the Epson printer and the prints are outstanding and I love the capabilities of the Epson WF 3640. But do not kid yourself, the printer is great and can be had for under a $100 but to replace all the ink cart will cost you on average $60 a whack, two change out and one could buy a new printer. It is what it is and with the drops in price of good multi capable printers to be had, Epson and others get the customer in the cost of ink. Total over priced item but needed nonetheless. Hihgly suspect if any of the colors in typical use get 350 pages per carts for standards, the XL in colors are only slightly better and not worth the extra cost. For the black it is a better value for the XL, but ink is way over priced for consumer printers.