Well I have only had a few hours in and coming from a Porsche 911T (claim to fame is less sound dampening and light weight), the cabin is too quite like a Cadillac should be, but the exhaust really sounds muffled on the BW by comparison. I can live with it but very different from the 911.
Oh and the stereo does not allow me to set audio settings per source. ie USB media with lossless audio sounds great in the car and I can maximize the equalizer accordingly, but then when listening to spotify I cant set different equalizer settings, and AM radio for talk shows. Yeah Yeah I know listen to the engine and exhaust but see my first comment ;-)
Nothing that warrants me to sell it though - ha!