I thought I'd give this a go, cause it was 50% off. I've been using photoshop for work and pleasure since '98, and am proud to be self-taught. I've pretty much got the hang of doing anything I want to do, and like all photoshop users I know, have my own particular way of doing things. After only completing the first couple of lessons, I have learned masses of stuff. Nothing ground-breaking, nothing new, just better ways of doing what I already knew.
I once had a maths teacher who explained things in three different ways. The first time half the people got it, the second time 98% of the class understood, and the third time meant that everybody could go away having learned something. This book is like that - it teaches you how to do things in different ways - of course this may seem long-winded, but in the end it makes for much more effecient work.
I've ordered a couple of others from the series now, because I can see that just by reading through them I will work much better. Oh, and the pictures are so good, that I can read and understand it without being anywhere near the computer (although that's cause I'm familiar with the workspace - if you were new to photoshop you'd have to sit at the computer).
The information is heavy and serious, but it is broken up into managable bits, and instead of going away feeling like I've slaved away, I put the book down feeling that I have achieved something. It's also part of the official training for becoming an Adobe Certified Expert - which can't be a bad thing...