John, if you plan to smoke jerky or sausage, it is a must. As said, these smokers retain moisture very well, which is great for ribs/butts/briskets, etc., but not so good if you're trying to remove moisture! Yes, you can build a fan that will pull moisture out, if you're handy and so-inclined, but the James Dryer is an easy off-the-shelf solution, if you need it. Works great!