Back on the 1uzfe subject for a bit:
http://video.google.com/videoplay?do...22662327174932
They really are that smooth even with a load of miles on them, I did the coin test on my one and it sat there quite happily at 6Krpm while a pound coin stood on its side on the engine and didnt vibrate off.
Didnt video when I did it, but here a youtube video of someone else doing it:
http://www.youtube.com/watch?v=8TYVLXYIo5o