At one point I had carbon super ergonomic bars that cost about 400.00 on my carbon bike. Frankly, I didn't notice any difference between them and my Specialized alu bars that are women specific, with short and shallow drops, in terms of the road buzz, etc. Since they cost 40.00 and fit me perfectly, I think I'll stick with them.
I have other bars on my custom ti bike that are very expensive, which the shop "gave" me, when I hated the ones I had originally ordered. I hate these, too because of the shape of the drops. I am going to replace them with the Specialized ones, as I don't care what the material is.
For me, the fit/shape is more important than the material. My hands don't hurt if I am not reaching too far or grasping too tightly because I can't reach.