The first set of cartridges worked great, and I couldn't even see a difference with the original HP ink that costs like 4 times the price of these. I'm now on my second set, and about 2 weeks after installing the cartridges, the yellow and the black won't print. It looks like the ink has dried up. I have checked and cleaned the printer, but it's still not working. It's still worth it, but know that some of the cartridges might not work as well as you might expect.