At the very first fill the sponge is still dry and he have to get thoroughly soaked. So wait a bit after the first filling and then again refill ink. (If this is not done, the prints can be a little weak at the first time.)
My printer (Canon Pixma IP 4950) recognizes the cartridge after insertion as "full". I am with the product so far very satisfied. The price of about 25 euros I find really too high - but that is surely everyone decide for themselves.
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Addendum of 04/02/2015:
Over time, a cartridge has become completely leak (plug torn), the ink drips out again immediately. In other cartridges I had to glue the small vent hole with tape so the ink does not drip out. Until these problems are, however, so far only in the large black cartridge occurred Pigment Ink.
