It looks like you have gotten a lot of great suggestions. The truth is if you drink kava long enough you will go through and try multiple ways of preparing. Traditional, aluball, blender, rolling pin, make your own extract, make your own microgrind, espresso maker....all have positives and negatives. Sooner or later you will settle on your favorite one or two that provide you the experience you want within the given time convenience you want to spend. I tend to do traditional prep 80% of the time and use my aluball for quick preps or travel. I guess my point is (since I am just rambling) is feel free to try multiple different prep methods until you find what is good for you. I find it part of the fun of drinking kava.