This is a condensed version of the original, and that's a good thing. The original, Latin, version runs to about 800 pages and full, verbatim translations run about 1500 pages. What remains in this excellent edition, translated and compiled by Theodore Graebner, contains the essence of Luther's teachings. Luther considered the book of Galatians to be his favorite and the one most useful for showing the true meaning of grace vs works.
You will notice a lot of time is spent attacking the Pope, Luther's former order of monks, and the Catholic Church in general. Please do not set the book aside because of that...besides preserving the historical and personal goings-on that Luther had to deal with during his life, it remains a common belief in many parts of the Christian world today that people teach and believe that sanctification is achieved, or maintained, through works. It is important to understand the book of Galatians in order to debate against that doctrine and lead people to the truth. I read a blog post just a few days ago by a person who said that the Bible never says justification is through faith alone...so knowing how to present Galatians to such people is important, and this book is an excellent aid in learning the doctrine of justification through faith.
There are a few typos, and it would be nice if there were a different font used for the text of the Bible to set it off from the words of Luther, but overall, this is an excellent ebook rendering of the commentary.
That such an important text can be made freely available to everyone is the highest and best use of modern technology. Please get this book, it's free...so what's the worst that can happen...you spend a couple days reading a book that is, at the very least, an important historical document and, at best, an inspired commentary on the book that tells us, once and for all, that our salvation lies in faith in Christ alone.