I like walking with a decent map and the best things about this guide are the 1:25000 OS maps - much better than those in other guides available.
On the other hand there are far too many negatives. These don't include the lack of info on accommodation which you can get from other sources. But I too suspect the author hasn't done the full route - the roller coaster stretch from Mevagissey to Black Head is ignored while a rather lesser one on the way to Porthpean is described in detail. Some sections (the Roseland Peninsula) are covered in far greater detail than others that are of equal or greater potential interest (Plymouth and Dartmouth). There is no discernible rhyme or reason in the way the route is broken into individual sections. These vary massively in length and can start or end at quite random points - Wonwell, the start of Section 7, is about as remote a place as it is possible to get on this stretch of the walk and I can't see how anyone would start a day from there. The guide's structure is curious. There's not much info at the start about the path as a whole, but then a strange piece on Conserving the Coast and the National Trust pops up at the end of Section 1.
And of course like all National Trail Guides you need a big pocket to put it in. Altogether, not the best guide to take with you if you are walking this stretch of the Path.