Instruct: Classify Amazon reviews into positive or negative sentiment
Query: KINDLE BUYER BEWARE!

Kindle buyers beware! Although this is an excellent book the Kindle version does NOT include the update service that printed version customers can get. This update service allows the book to be updated (they come in binders) so that changes in the law are tracked and updated with packets of new pages from PLI.The material is excellent, but considering we are in the midst of the largest change in patent law in many of our lifetimes (America Invent's Act, love or hate it) these updates are important. Right now if you buy this on the Kindle you'll have to re-purchase the whole thing at full price each and every time an update is required to stay current. Printed customers get a packet of new pages in the mail at a much reduced price per edition.The work is excellent as advertised and reviewed here. I use it all the time in my patent practice. I just wish they would start partying like it's 1989 at PLI with the Kindle version of their excellent books.