Does anyone have experience with the new product from the makers of the Draw Collar? It's called Air Damper. There was no description so I reached out to John, the owner. Its basically a draw collar that clamps on to the pipe instead of replacing a section. It also only draws 200W instead of 500W but according to him works as well as the Draw Collar due to a more efficient heating element. Curious if anyone has any experience with it.