Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Narrow focus, possibly misleading information.

The book is a primitively produced 'text' on installing radiant floor heating in new constuction using copper tubing embedded in a concrete slab. The book features type-written, photocopied pages; amateur, hand-drawn illustrations; and home-made covers. The pages are bound using some type of do-it-yourself manual binding machine. My copy was missing page 36.The content is narrowly focused on copper embedded in concrete. The subjects of other materials, installations in existing structures, or installation in structures other those using concrete slabs are mentioned only in the most tangental manner.In addition, reports of copper catastrophically (at least financially) corroding away when embedded in concrete abound, although this reader has had no personal experiences with copper in concrete. But the author's actual experience with radiant floor heating seems so limited I find it hard to have any confidence in his recommendations.