A few folk 'played' with these and I specifically remember both Mike Heritage and Lasse Karlsson casting the DT line well into the backing with Sandy's cane rod.
A few interesting comments about line weights and designs in this and other threads recently Paul, but you've got to remember that fly fishing lines are not made like machined metal products on CNC machines ...... liquid plastic, gravity fed onto a moving piece of string is not in the same league
Cheers
Mike