Wasabi?

And you thought you knew what wasabi was...
I think it's interesting that even when I was in Japan, I never got a chance to sample the real thing. There's only two growers in Japan, and one in the US, or something crazy scarce like that. End result: what we consider wasabi is food coloring + horseradish. And mixing it in your soy sauce first? Totally not cool, Wahby. But we've had that argument before.
The question is: is it worth making a reservation at SF's most famous sushi place, the one that I've been thinking about for a full year, to experience real wasabi the way it should be eaten?
Or should I just mail order some grown in Oregon!
***1/29 edit***
Justin took me to Kiss Seafood for our 2 year anni dinner and...the fresh wasabi was good. Almost nutty in it's heat, tasted like grated vegetable more, but on the whole...I'd say the fake stuff actually does a decent imitation! The fish however, was amazing. Best sushi/sashimi I've ever had, even better than when I was in Japan. Of course, I didn't have much money when I was in Japan, so it's probably not a fair comparison.