As remarkable a career as he has had, imagine if he'd been a stronger putter...That guy tinkered with more putters and styles in the search for putting nirvana...Remember the putter he used to win the Masters??!
Also used very successfully by Gil MOrgan and for a period of time by the leader of the Tour Championship - Henrik Stenson!
I too share the quest for putting perfection and at one point counted one of the early versions of the Dandy as part of my putter inventory. Once grooved, the short putts were a no brainer. Longer putts take a lot of judgement for speed (regardless which putter you use, but more so with the Dandy IMHO).
Ultimately, I found the putting technique to be quite sound though my game stick these days is a Cameron Circa 62 #5....