So far, although I have only experience with the black cartridge, but this is quite positive. While in the first two printings the first pages were each white "printed", but there was then no further problems. The capacity is very good at a price of about 2 euros (incl. Shipping).
Not even with the use of text markers - The term does not smear.
Bie at savings of up to 90% per cartridge (black) this set is highly recommended.