I'm gonna give it a try one day with my root (but not Fu u, it's too fine). I think it should work excellent. I have one of those spinny deals. I was thinking maybe even running it through 2 or 3 times to get every last ounce out.
The only reason I just thought of this and searched was I just came home with a juicer and a buttload of veggies and fruit to try it out. Worked out ok. Not nearly as bad tasting as I thought it would be (hey, i like kava, what WOULD taste bad! lol). I did a whole bunch of celery, 2 radishes, 3 carrots, a cucumber, a stalk of broccoli, 4 pieces of pineapple, a bunch of spinach and some parsely.
IT was actually kinda watery. I think I'll throw in a little apple next time. IT actually made a LOT more juice that I thought it would and what was left resembled kava root (in texture only, and it was pretty dry).