Is it possible to do in the oven whatever you might do in the food dehydrator? Over the weekend I dried tomatoes in the oven. It took all day and some got browner than others, but wouldn't this also be the case in the dehydrator? I will dry a lot of food, especially toward the end of the summer/early autumn when all the stuff has to be yanked from the vines before a frost hits, but I guess I'm wondering if I should buy a dehydrator or if it's just another kitchen gadget that I don't actually need? Are there disadvantages or problems with using the oven instead?