I found this to be one of the most enlightening teachings that I have bought from Catholic Productions. It helps understand the role of the Mass in the salvation of all mankind, and also how some of the critical prophecies in the old testament are being fulfilled through Christ. It discusses Isaiah 25, which is a very important prophecy that all catholic should know, and also some other verses from the book of Ezekiel and from the new testament. Its discussion of that verse in Matthew 8:11 is so enlightening and really helps to interpret the prophecies of the old testament.
Also, if you want to understand the flaws of the protestant approach known as dispensationalism, this is the best teaching that I have found to clarify it.
In summary, this lecture is a must, and considering the price I cannot think of a better value for your money.