I'm the CEO of a web consultancy (www.mwi.com) and so I was curious to see if this book would bear out what I already know about designing websites. When it comes down to it, a lot of what Seth says isn't anything revelatory, but it makes sense.
If you already have considerable experience designing on the web, I'd say it's a good read because you might learn one or two things that will help you improve what you do, and at least you can then tell people "Experts say the way we do this is the right way."
If you have no experience on the web, then this book will be something more than just a review and I would highly recommend it.
Best of all, it's short and to the point. You can read it in about a half hour.
It makes one good point, "Good sites are made by 'concept artists' not IT savvy programmers!" It's a good read however, Adobe's e-Book reader is utterly useless and a constant nuisance. Although the Adobe reader has some cool features including a dictionary, I didn't like the hassle of handling the pages all the time by zooming in and out! The usual PDFs are great!
The other problem is that sharing the e-Book is difficult among my home computer and office PC. Amazon.com doesn't allow more than one download, on e-Books. (I've not downloaded a Microsoft Reader book, yet.)