I switched to a arm only stroke when I visited Ted and Yoda in February earlier this year. At first it felt strange setting up but I saw a difference right away in striking the ball more in the center of the putter (distinctive sound when the putter hits the ball square in the center). The ball was definitely rolling better.
Took a couple of months to get used to a open stance with allignments and reading putts, but now I am completely comfortable with it. I get a lot of comments about it (I was in a tournament and someone asked a friend of mine why I putt like that), but the results speak for themselves. I averaged 36 putts last year a round, and had several 3 putts a round. Now I average 31 putts and the 3 putts are pretty infrequent.
I am definitely a fan of the arm only stroke.
Keith
PS-I have played a lot of golf this summer and haven't seen anyone else use this procedure yet (don't play with any TGM'ers though).