We have two composters, both the same, they don't stink when
composting directions are followed... composting should emit a sweet
aroma like that of a healthy forest floor. A lot depends on what one
is composting, some things don't compost well; corn husks/cobs will
take forever to compost and yield very little humous, banana peels and
melon rinds are best left for the deer to compost. Coffee grounds
compost well and don't stink... toss the filter paper in too, egg
shells compost well and add beneficial nutrients to vegetable gardens.
We have two of these, they last a very long time, ours are over 25
years old:
https://www.amazon.com/Algreen-Products-Saver-Classic-Compost/dp/B003959G9Y/ref=sr_1_5?ie=UTF8&qid=1407777669&sr=8-5&keywords=composters
The composters that hold scraps above ground, like those rotating
drums, don't compost, they ferment and stink. Keep in mind that earth
worms do not compost, it's the worm castings that are composted by
microbes.... adding worms makes a composter stink as the worms die
when they can't return to the ground.