Man one plane up and down would be incredible, if it fits you and is repeatable. . . so many winning swings out there that look so different.
article on one plane and two plane swings:
http://www.worldgolf.com/golf-instru...-tips-4612.htm
Also, there is a GREAT article on golfdigest.com about how Jack's swing changed through the years. More evidence that not only are there different kinds of winning swings, winners CHANGE their winning swing and win MORE! (Tiger, Jack, who else?) Sheesh!