so far we have been very happy. we had a bit of a learning curve coming from an old laser printer but so far we have had little problems. we have a 4800. when we first got the carts, two of the chips on them were bad. Ross (guy who I talked to a few times) sent us new chips to put on the carts and from there on out, they have worked flawlessly. the ink seems consistent from liter to liter.