Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Planned obsolescence

Copyrighted in 2001, the Cisco CCNP library has already been rendered obsolete by Cisco themselves. Not only exam revisions, but a fundamental structural change to the CCNP examination series has taken place in the short time since these books were put on the market. Unfortunately, I can see no other benefit to these books beyond providing a revenue stream to Cisco. There are better books available if one is looking for truly educational technical books rather than exam-specific guides.