We have had 2 SVR's. We had one with carbon, one without.

The carbon one was worth every penny! The extra door storage is great as well. 2008 Range Rover Sport TDV8 HSE
2013 Range Rover Sport TDV6 HSE 8 Speed

I think the carbon option is well worth it and includes the steering wheel trim as well. I also have the engine cover which is obviously more marginal.

I think the cost of the option is reasonable and it looks goof. By comparison, I have recently ordered a new Ferrari where, if you go mad, the cost of carbon can be over £30,000. Mark

SVR in Estoril Blue