The Gene Cafe has a half pound batch capacity, and uses a unique off-axis mechanical agitation with a hot air heat source. The roast is easy to observe, and the controls make it easy to modify; change the roast time or roast temperature any time you like, and as much as you like. Latest Model - Gene Cafe Roaster It features an oversized chaff collector that can deal with the most chaff-heavy coffees. The roaster is extremely quiet compared to air machines, and even compared to other drum roasters. The Gene Cafe is a machine I tested for over a year, through the stages of prototype development. It had been sold for a year in Korea (where the manufacturer, Genesis, is located), the UK, Europe and Japan before finding its way to the US market. The machine has CE approval - which is like UL for Europe. We have carried this machine since May 2006 and it has performed well so far and the documentation that comes with the roaster is very good. The so-called "Analog" model we offer here impressed me from the start, even when I tested prototypes that did not function well.