The vortex works as described above. I own one. Concentrates the heat and uses the shape of the kettle to its advantage. You can cook great wings with it, but you can cook great wings without it. You've got to try it to see if you like it, but that's a $50 gamble. I gambled and am happy.
I do find that i'm able to get a better cook out of floured wings with the vortex than without. With the vortex, the floured wings are like fried chicken.