Instruct: Classify Amazon reviews into positive or negative sentiment
Query: nice for annotation

I liked this product well enough after the 30 day trial to buy it. Main feature for me is the ability to annotate PDFs using a tablet PC. Very nice for copyediting, much faster than dragging/typing on virtual sticky notes. The interface is customizable so you can have it be terse and "confusing" or simple and menu-driven.The price is high, but it's justified if your work involves a lot of copyediting.