The Ryrie Study Bible has helped me to understand some passages that were difficult before. There are plenty of footnotes and maps to help understand content and context. The concordance is also very helpful. It is an all around excellent source for serious Bible study.
I became familiar with the Ryrie Study Bibles in 1986 with my first NASB purchase. I have worn it out and now I have the KJV as my third. The Ryrie Bibles provide great, thought provoking commentary on some difficult subjects. I recommend the Bible to anyone.