I traded my old Sport Auto for a 63 plate demonstrator Sport Nav petrol in September.
So far so good - the car is a lot more refined and more economical than the previous model (although that was an Auto). The overall quality of the car feels like a step up from the last model.
The only slight criticism is that the gearbox feels a little notchy when cold, but that could be down to me driving automatics for the last eight years.