Instruct: Classify Amazon reviews into positive or negative sentiment
Query: very poor at many things

Pro:Cheap,Con:When turn it on, it doesn't automatic enter to the dictionary. You have to selected dictionary, so you're wasting time. New words in English language seem not there. The front size is very small to read, and visibility is poor. You will need an eye 20/20 to use it. As far translation is concerned 40% of the time that thing can't.