I read an article about braid and leaders and I think it was Dion Hibdon who said he did not use a leader until his son said he should use a leader with braid and talked him into it.  Now he always has a leader on braid but he did not think it made a difference in catching fish, it was more of a mental thing.  Another top level pro, maybe Dean Rojas, said he uses a leader, but if he breaks the leader off the braid he does not bother tying on a new leader he ties the lure straight to the braid. 

All braid, all the time, never used a leader. I fish a lot of clear, rocky rivers. I've never had any issues with abrasion. Just never had a time when I said "I should have used a leader".