Overall I give this book four stars. This is a REFERENCE book; not really intended for beginners. However, I read about some properties I did not know existed previously, so I learned a lot in addition to having one place to look up everything. I do like that it's hardcover--though I wish one of these days Sitepoint could make books that are able to lay flat!
I also like the fact that after every property, there is a little box that explains which browsers are compatible with it. The book even explains if the property is buggy (looking at you, IE), and then delves into why and if there is a fix. Unfortunately, this list will soon need additions to them, with the coming of IE8, Chrome, etc, etc. Still, very useful.
It doesn't receive a perfect five because I wish more example pictures could be displayed. I don't mean for the very basic things (like the height property). In some of the explanations, I was only 80 to 90% sure of what the paragraph was talking about, and with web I am very visual. I know this would have taken up more space, but I felt it was needed (but only for certain sections). I also didn't like how the "index" is set up. I think there should have been another index (keywords) in addition to the current, property-only one. For instance, div isn't even mentioned there. I know that's an HTML tag but it would have been nice to see all the keywords throughout the book regarding it, considering its interaction with CSS. I guess I'm not used to that sort of index, which is basically the Table of Contents but at the end of the book.
So yes, I would say if you want one book to look up all the different properties of CSS, this is it. Again, this is a reference, not a book with tutorials and explanations on how to create something specific (recommend the anthology book for that).