How to Write a KILLER LinkedIn Profile... And 18 Mistakes to Avoid contains a wealth of information. The author does a great job of pointing out mistakes that many job seekers and recruiters make with their LinkedIn profile. She then goes on to describe the problem, how you can fix it, and results to expect if you do. It is obvious that the author knows LinkedIn very well, and given her success, also knows how to make it work.
I did have two criticisms that kept me from giving it 5 stars. First of all, I feel that the title is a bit misleading. I had assumed, based on the title, that the book would help you write your profile (presumably from scratch). Then in a second part of the book, she would talk about the 18 mistakes. The truth is, the first chapter is the first mistake. Don't get me wrong. The information provided in the 18 mistakes is amazing, I was just hoping for a bit more help crafting some of the sections of my profile.
The second criticism I have is the amount of promotion the author does for her company. Most of the chapters have a plug for her company offering to fix the mistake she details. While I'm not saying she isn't entitled to promote herself in her own book, I feel that after dropping $10 on an ebook, I should get the ad free version.
TL;DR - A great resource for anyone looking to polish up their LinkedIn profile whether they are new to the platform or a veteran. Just be willing to put up with some self promotion.