We used air filters for furnaces that we found at home depot and so far I've only dried the herbs from my herb garden with it and some hot peppers that we turned into a dried mixed pepper powder. The herbs came out great, they still had good color and were very crispy and crumbled easily. The peppers took quite a bit longer and required a couple flips so they dried evenly on both sides. The ones that we were going to turn into powder were cut in half and seeded and the rest we dried whole. The whole ones took awhile longer to dry. On the whole, it's not a hard way to dry things and you're house smells great while you're doing it. We haven't tried anything wetter than peppers so far, if you do the tomatoes please let us know how it comes out!