I haven't tried Kave root but I recently got some Kratom capsules from the head shop close to me. They offered a slight euphoric feeling with a giddyness similar to weed and a antsy/super focused similar to amphetamines. However, I only got these results taking it on an empty stomach and walking around. My boyfriend and some friends didn't feel much at all. I am tiny so I have a nice low tolerance to such things. It didn't cure my hangover though when I tried it, but made my work day slightly more bearable.
Intriguing. I assume kratom is some sort of kava extracted/isolated substance? The kava teas I've tried have only induced a rather deep state of calm in me, not anything like antsyness. However, I know these things vary widely from one system to another. Let the great experiment continue!