Instruct: Classify Amazon reviews into positive or negative sentiment
Query: buy only if desperate

The Sybex Virtual e-lab Trainer would have been a decent $... software package. No way is it worth $...! It is buggy and very limited in what you can do. Some commands don't seem to work at all. Consider it only if you've never worked on a router before and don't have a clue about how to get access to one.