I got some of the carbon parts this week for my new durga, the top decks/covers and the shock towers. the towers look to have a lot more carbon in them but it might be the way they are moulded? they are just a lot more 'grey' in appearance.
The car definitely feels stiffer with all the parts on - I think that'll be a good thing for high traction tracks and to make the car a bit more consistent, but I did very well with the standard plastics so I'm not sure how these will go yet, we'll see.
I also got the TA05 carbon cell strap since the kit strap is like rubber! this should also stiffen the car a little.