I first saw it on a VHS in the early days of my attending the Telluride Bluegrass Festival, and of course what immediately struck me about the performance was the interplay between Edgar Meyer (bass) and Mark O'Connor (fiddle). Edgar is full "goad mode on" here, and O'Connor just tears it up.
At the time, my wife (who wasn't exactly heavy into bluegrass) commented that that fella may look like a truck driver at first glance, but then he does things you don't usually expect truck drivers to do.
And then some. O'Connor does things you don't usually expect mortal human beings to do.