Don't believe that part of the infomercials! The Nutribullet will do a worse job than the Vitamix. Neither the Vitamix nor the Nutribullet is a juice extractor, which means that they do not remove the fiber. With a blender, if you want a juice there are three things you can do:
-Use juicy ingredients like grapes.
-Add some liquid (water, juice, or milk).
-Blend and then strain. (For example, check out this Vitamix carrot juice:
http://joyofblending.com/vitamix-carrot-juice-100-undiluted/ )