These cartridges represent excellent value for money for everyday printing. On the plus side, they have never caused blocking of the print heads, which some compatible cartridges do and ink costs are low. On the minus side, the ink is not so light fast as Epson Durabrite so fading can be a problem when prints are used in strong light. I've used these cartridges for some time now and some of them are not immediately recognised by my Epson DX4200. The problem is poor contact between the cartridge and carrier. If the cartridges are rocked from side to side WITHOUT removing them from the printer, the problem is always resolved. Nowadays, I clean the terminals of the cartridges gently by running a steel blade across them a few times prior to installation. Doing this prevents the "cartridge not recognized" error from occurring.
To summarize, good value general printing cartridge needing some care in installation. Use Genuine Epson Durabrite only, if you need fade resistance in bright light conditions.
I've given up buying branded ink. In fact now I only buy printers that I know I can get cheap ink for. These are just about the cheapest cartridges I've ever found. I buy them and use them for work and don't even bother claiming the cost back from the company. They're so cheap it's not worth doing the paperwork :)
I'll be sad when my printer finally dies because I don't think I'll find another that uses ink this cheap.