Hi,
I have one similar to the one you are looking at, it works fine, for the stuff I use it for.
When I first got it I tried drying all sorts of stuff, a lot of which I wouldn't bother with again, I tried herbs in it, but I actually prefer to dry mine in the oven, seems to keep the colour better, the things I use it for now are making banana chips, semi drying and fully drying tomatoes, mushrooms, sliced potatoes for on the top of hotpots and for veggie bakes, I tried diced potato and vegetables for soups but didn't really like them, bread for breadcrumbs.
I only usually use mine now when I have a glut to process.
Regards
Sue