I don't have it, have never looked at it, but have used other Chilton's in the past. I think most people use the BMW TIS, available on e-bay and now online. The problem with TIS is it's light on procedure and heavy on special tools, and assumes you're experienced working on BMWs. Chilton's can have better procedural info and work-arounds for special tools, assumes you're mechanically inclined, but not necessarily experienced. It tends to have a fair bit of general info that would be useful to the inexperienced. OTOH, the info can be too generic so they can cover a range of vehicles, and the overall quality seems pretty variable due to the cut and paste character of the book. Sometimes (rarely) the info is wrong, or conflicts with a related section. Also, a large part of the book is dedicated to procedures you'll never do, like rebuild the transmission. Some manuals had no electrical diagrams, but that may not be feasible with modern cars anyway. I can't imagine how to put the WDS in print!
My opinion is more information is better, I would consider Chilton's myself once it covers my car, even though I have the TIS.