Not so much that they are the "best." I just like the variety of hand positions available on them and personally find them very comfortable. Unless I am under a high power effort, I just rest my hand on top, with my pinkies off to the side of the bar for some control.

They're supposed to be both comfortable and aero. The bars themselves aren't going to make you appreciably more aero, but hopefully they can help you get your body into a more aero position without making you uncomfortable. I don't know what you mean by "ride high". Are you stretching out farther? Do you just sit your hands up top?

If it's just a shifting issue and you want to get R-bends, then get them. I rest my hands on the shifters, too, but because they point straight out my hands are still in line with my arms. They probably won't make you any faster, but if they end up being more comfortable, then they're worth it.