Am I too late giving my 2-cent worth of what I know about wasabi. I'm no Japanese & I love Japanese food & wasabi to go with it. I was having lunch in a Japanese restaurant when the Japanese manager corrected me on the right way to dip sushi & raw fish in wasabi. The wasabi sits in small dish of light sauce specially made for sushi & raw fish. One mustn't stir & thoroughly mix the wasabi & sauce. Simply pick the wasabi onto the raw fish or sushi.
Also, not to eat too much especially if it's in the powder form.
The taste & feeling of wasabi is different from chilli. While writing, I could feel tears rolling down & 'smoke' coming through my nose & ears. The after feeling is just great.