Well worth a few minutes to watch this. There are a few other threads on this forum about Edel putters, aim bias when putting, etc.
Virtually nobody can "get fit" as quickly as this guy. He was one of the few who was aiming inside the cup from six feet with his original putter. And this video doesn't show the speed testing that I think is almost a bigger and more important and revealing part of the process.
Edit: See post #10 for another great video.