Both models are very quiet, but also very slow when compared to juicers that use centrifugal force to separate juice and pulp. One owner, posting on Viewpoints.com, estimates that it takes 25 to 30 minutes to juice a glass or two then clean up his Omega J8005. But others warn that the Green Star GS-2000 takes even longer to clean. The small-diameter feed chutes on both models also require chopping fruits and vegetables before juicing. Both juicers handle greens very well, but users are distressed by the GS-2000’s tendency to create a lot of foam when juicing greens and soft fruits like cucumbers. The J8005, by comparison, receives raves for its ability to juice greens completely and with less foaming.
Source here: http://www.consumersearch.com/juicers/best-masticating-juicer