This is my 3rd Zig Ziglar purchase, and like the others I loved it! Granted there is some repetition, but that just helps it to stick in my head. Nothing bad can come from listening to his recording, and most likely it so much more for you!
I keep going back to this audio it is timeless and there Zig Ziglar although 'just' a salesman he is actually better than most of the professionals ie psychologists and academics who write books and speak. Anyway you can see I really like this audio and have listened to it probably 100x plus.