Ed, Their live album is one of my favorites. I think each artist was good in their own right but I think together she can sing, without the sturm and Drung of being the "next great female guitarist" and he has a passionate singer that he can bounce his solos off of.
From their live album, my favorites include Everybody's talkin', Midnight up in Harlem and Wade in the Water, they all sound great on my Vapor Joules.
Phil