The primary reason I want a rocket stove is for the garden. Each year, the garden produces a large amount of twigs and fibers that I can't efficiently mulch; So, I toss it in the garbage. With a rocket stove, I could burn that waste to boil water for my morning cup of tea.
The oven attachment would be a cool addition. I could bake bread.
The rocket stove is $125, and oven attachment $110. The site RocketStove.org has the scoop on building one's own stove. (more)