Bitted - Bitless?

With nothing to do but sit on my **se and be grumpy, i've been mulling over Trudis' recent threads on bitless.
I've no doubt many people ride their horses this way with varying degrees of success, but having done many searches for videos of collected riding bitless, I've come up with very few examples.
This guy crops up quite a lot,I don't know anything about him, but he seems to be quite controversial.

I know Klaus Ferdinand Hempfling rides some of his horses in collection, bitless, but I don't know if they were trained bitless as it seems he feels the need to also ride with a bit.

It's a very thought provoking subject and I will be following Trudis' findings with interest. With a youngster ready to start I feel that I owe it to him to go there and investigate, but I have to admit that I'm pretty scared to do that as it may turn my thoughts on bitting completely upside down!!