I haven't used mine as much as I'd like to, but I have done apples several times and originally we got it for Jerky... DH now has a large propane smoker so we don't need to use it for that any more. I have also dried berries. I think part of why I don't use it as often is it seems so small- one of the round ones... by the time I go through all the mess and effort to prepare all the stuff I end up with a small bag of dried apples- and can eat them in a day LOL!
We had a really big one growing up and my dad dried all sorts of things from our garden and fruit from our trees, and made fruit leather. YUMMY