Does anyone have any comments or experience with this concept?

http://www.rioproducts.com/product.php?recKey=33

If I'm reading the specs correctly the WF5I/F 's total head weight is equal to an 8wt. They don't say how much heavier the first 30ft are.

I guess you'd need a very fast rod? I was thinking it might be something to use when sitting in a pontoon on a lake when you want to cover as much water as possible. I don't think I have a fast enough rod