Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A bit pricey but works like a charm.

Not much to say. If you have a monitor with the ADC (Apple Display Connector) and a laptop with only DVI you need this to use your monitor and there are only a few to be had. So you pay what you have to to get what you need. As far as functionality goes, it works great. No complaints whatever.