I haven't finished the book yet, but so far it has been very good. The introduction gives you an excellent amount of information dealing with the less theological side of the book like the language, author, date, purpose, influences, vocabulary, canonicity, and a lot of other stuff. The actual commentary is also very good. For each section it gives a summary and then it goes through the section verse by verse (or a few verses at once sometimes). There are plenty of Scripture cross references for the points he makes, and footnotes on each page which provide other good expositions to consider reading.
Overall its very good, and I would definitely recommend it.