Gotta put in my two penceth.
@ Spanner
Butterfly bars – NOOOOOOO! Don’t do it! I rode a 3,500mile tour on them and have vowed never to use them again. A flat bar with LONG bar ends works much better, atleast for me.
I set them up nearly flat so I could stretch into them.
The curves between the flat section where your brake levers are and the forward facing bar endy sections have a really large radius curve which is really uncomfortable and stop you hooking your thumbs off the edge. Takes quite a bit of usable area off the bars, both fore and aft aswell as side to side.
I also found the forward aero section was always just TOO far away to be useful. (and I was a fairly flexible 21 year old when I was using them)
I then tried moustache bars set slightly closer to me than the butterflies. They were super-comfy but the brake levers were always in the wrong place. The levers never followed the angle of my wrist during braking and you couldn’t set them up to without losing the hoods position.