A riding buddy of mine has ridden his BiSaddle for many years. He's a randonneur and has ridden PBP on it. In his opinion there is no downside to this saddle.
Revolutionary Noseless Bicycle Saddle -

Yep, it's expensive, but it's the only saddle he can ride. I've looked into the saddles you mention as well as others, and don't think I'd like any of them.