Ebony boards look great, clean and sharp, like a fitted suit in deep, deep black. I don't really pay any attention to how they feel - maple, rosewood, ebony or whatever are all suitably hard woods with which to make a fingerboard. I've got nothing to say about tonal differences, partly because I've never noticed, I've never studied it in any depth, and frankly, I don't care. It's purely an aesthetic choice as far as I'm concerned.