I highly recommend this product. Although you can run 3:16 off the cuff or do your own prep the scenarios in this book are detailed and offer lots of great ideas that you can incorporate into your own adventures even if you don't use them whole cloth. I bought it the night before I was running 3:16 at a convention and the players loved it. Not all adventures are of the same high quality though. You may want to pick and choose which ones you run.
[4 of 5 Stars!]