I have Photoshop 5 In Depth and ordered PS 6 ID, assuming it would be as good as the first.
I discovered immediately that it was a poorer version of PS5 and was highly disappointed. It's a basic repeat of PS 5 In Depth with very little to add sprinkled with SO many mistakes.
It's not as thick as the PS5 ID and most of the new material is on the CD. It's very difficult to try to follow directions when you have to use your computer to read...or print it out, costing you even MORE money after paying so much for the book already. Even then, the book and ebook just skimmed the surface of all the new functions Photoshop has to offer.
I feel the authors were lazy in compiling this book and were just waiting for the money to roll in. Productions costs were cut (less ink and paper than the previous issue) but the cost of the book remained unchanged.
It's a good book if you don't already have it as part of your Photoshop book collection, but it's not a good upgrade if you already have it. Be ready for stupid mistakes. I don't feel they really reviewed the PS6 upgrade before publishing the book.