I found the Program Color to be pretty intuitive and had the opportunity to use it in a professional environment before reading about it. Nonetheless, this book has been most helpful for filling in the gaps in my knowledge where intuition wasn't enough, and as a way of checking my assumptions / methods against what is prescribed. If you don't know that much about the program Color this is an excellent book to have. Of course, when it comes to really using and understanding the program the footage on the DVD is critical. Here are a few things to consider.
1) A good bit of the footage on the DVD might be thought of as fluff footage. That is, it looks bad uncorrected but its pretty easy to make look good. Keep in mind this footage is supposed to be easy to correct, so unfortunately, it's not a reflection of our natural skills as colorists when this footage starts to look good with little effort.
2) Some footage has characteristics not mentioned in the text, so you might be left scratching your head a few times. For example, the clip called "Car Shot Wide" used in chapter 1 has a flaw in the whites, bring down the luma of the shot and you'll see symmetrical curves appear on the right and left of the car. Raise the luma back up to more normal levels and you'll see these curves don't go away they are just far less visible.
Also take a look at the shot called "Car Track MS" look at the top third and bottom third of the shot. You'll notice that the top of the shot has a magenta hue, and the bottom is slightly green. These features and others are not mentioned in the book but you can use them to create additional exercises for yourself by using Color's tools to clean them up.
Other things to consider:
1) Color is still has a fair number of bugs, so when the program does not behave as the book tells you it should, you will be left wondering what is going on, and with no good way to get around the bug.
2) The book is a general guide so it's a bit short on detail on issues faced all the time in the professional world. For example, the book contains an example of a way to smooth out skin, but I didn't think the shot for this exercise was a good choice, further the logic of how the smoothing effect is constructed in the book didn't make a lot of sense, and didn't work well enough when applied to footage I was dealing with on a show. There must be a variety of ways to smooth out rough textured skin in color but the content here was pretty light.
There is a lot more to say but in short, this is a very good book and has a great deal of useful information, buy it and enjoy. Just, keep in mind that there is plenty of room for a second volume.