just black / color changed and all cartridges have been identified - with my "Epson WorkForce WF-3540DTWF". The printing result is OK. If in the near future appears no problems with leaking cartridges or fast one-drying ink, 20 cartridges with XL-filling for 23 are fabulously cheap. The same amount to buy in genuine Epson cartridges would go into the hundreds of Euros.