The warning is to wait before praising the product. The first week with these cartridges was great, but after a few weeks the print quality dropped to x@! No matter how many times I cleaned the printheads, a reddish orange streak covered every color print. This was very frustrating because we really wanted to save on ink costs when making promotional materials for the company. We will definitely return to HP cartridges in the hope that the problem is not permanent. I was trying to save a few bucks and got frustrated but I think I should have tried. Some have had success, but my HP 8610 has not.
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