I found it entertaining, but it seemed to me that the debunkings missed the point on more than one occasion. For example, the woman who felt it would be impossible for a hijacker to fly a jet into the World Trade Center. While it was cool to see one of the gals learn to fly a small plane, why didn't they instead have the Truther learn to fly a 767 flight simulator and see if she could hit a similar target?
And when the other gal brought up the security issue and Bush's 8-6-01 warning about hijackings, I had to wince a bit when the pilot claimed there hadn't been a lot of hijackings in the US and there weren't many metal detectors at the airports. Sorry, but neither statement is true; there were certainly metal detectors at the three airports (Logan, Newark and Dulles) that the flights on 9-11 departed from. And there were hijackings in the 1970s and 1980s, which is a major reason why there were metal detectors. The real issue is that the hijackings on 9-11 were vastly different than ones in the past as they turned into suicide flights, while in the past they had simply played out as hostage dramas.
Update: Some profanity, probably NSFW.