It was rather harsh with schools in general, but I think it gives great ideas for how teenagers can get a real life education and get in the real world. It was rather dated with some of its suggestions, especially the portions that dealt with technology but that is expected whenever you mention technology in a book. However, that in itself might turn some teenagers off. However, since the premise of the book is about quitting school and unschooling yourself, most teenagers I know will look past the dated technology parts....
Definitely a must read if you are homeschooling teenagers and worth a read for any parents of teenagers as you can get something out of it for anyone. I think if you are considering homeschooling at all, you should read the book so you will have some sort of confidence about what you are going to do come the teenage years, which like it or not, sneak up on you quick!