I bought a dehydrator about 6 years ago, and sometimes I wonder if it's actually worth it.
It takes hours to dehydrate food and I always worry about the use of electricity of course.
I also feel that sometimes I leave things in the dehydrator for too long. It's always hard to figure out when exactly it's ready to come out.
One thing I like to use it for, is herbs like cilantro, parsley, basil, etc..
The herbs don't take long because they are thin, and I know it saves money. Herbs are not cheap.