I can understand the attraction of a drifter on some of the faster, rocky East TN rivers (upper Hiwassee, maybe?), where boats like a gheenoe cannot go as easliy.
I don't understand the need for one in Middle TN though.
Their layout does make them a good boat for a fly fishing guide - you can row from the middle, have one person fish from the front and one from the back, and they are raised up enough that their casts are safely away from the guide's ears.
But other than that, the "cons" outweigh the "pros" for me. You don't really need the high bown and stern and stability for our local class-1 water, it's hard to fish out of one solo, they don't trailer easily, and without an easy way to mount a motor, you can't run back upstream.
What am I missing?