Provisional: Best

However, a final judgment on printer cartridges can indeed form only if you know how many sites have reached the cartridges. As I previously only a black cartridge had dawned, I will report in due course again at the moment.

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Update 01/09/2013:

I still have the first black cartridge in the printer and it will print and print and print. I can not page numbers say (find something difficult to estimate), but I really have a lot of scripts and other texts printed since the cartridge is inserted and until now is still no end in sight. The supplied when buying Epson black cartridge seemed not so much to give away as these cartridges me.
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Update 4/29/2014:
Unfortunately, my printer Epson DTWF 3540 were in recent months in seemingly (!) Ever shorter intervals the message that a cartridge can not be recognized. This message always occurs in the middle during a print job and can not unfortunately deal unlike to throw away the cartridge in question and replace it with a new one. My guess is that Epson has since carved out a firmware update that will eliminate foreign ink. Probably in the end this foreign ink is still cheaper than the original ink. But just annoyed with the frequent changes.