The run flats demolish any kind of comfort you may have as a driver.
Although you will enjoy the exceptional fuel economy, rattles and rough ride the rock hard tires reverberate will annoy the hell out of you.
I replaced all of the times to conventional tires, although 2 mpg less effecient, very quiet and smooth ride.
You can now enjoy to cabin free of annoying rattles and such; although I still insulated noise producing areas with felt, I can now enjoy the actual cabin, all thats missing is a TV. Hands down the best car I could have purchased for the price (bought used with 8k miles)
Interior, NAV, Dashboard is the best I've seen; although only thing that could be better is a digital speedometer read out.
fix rattles/noise in dash in cold weather, aux input, i think thats about it.