Kind of neat, I guess. Maybe it's me, but I didn't find the demonstration impressive (then again, we're talking about 6 years ago). Huge Texture Dome (1:33) was kind of cool though. Also liked the Environmental Mapping Metal Mario!! (6:27). I remember it used to be a big deal to accurately portray the environment in the reflection of a car with all those different surfaces, so it was entertaining to see the same sort of thing applied to Mario.
However, now I officially deem the Yoshi drumbeat version of Delfino Plaza to be the most annoying song to listen to when played over and over. Those drums drive me up a wall.