Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Avoid due to costly, hidden design.

As mentioned by a previous reviewer, this unit requires that you maintain COLOR ink levels even if you never need them and prefer to use BLACK ink instead. I never used the color due to the poor quality. Over time, the unused color ink dries out and the machine forces you to buy and install new color ink in order to continue with operations. A very poor and costly feature. Get another fax. This one is junk.