I have purchased the Burchett book by AB but not yet had time to look at it in great depth. It has been compiled largely from secondary rather than primary sources as far as I can see, so you may already be familiar with the material. There is a very great deal of material about the Virginia descendents of Edward Burchett who went to America, to Virginia, in the 1660's. In total about 400 of the nearly 900 pages of the book follow Edward's tree. Virginia Burchetts figure in other trees in the book.
For me it is certainly a valuable document, particularly since I am undertaking my research from Europe.