Yeah the run in is pretty important for the high rpm range performance. So you would want to get it right no matter what. Sure the engine is broken in on a dyno in the factory but that is only the initial bit, the 600-1200 mile part can make quite a big difference in the overall end performance. The finish inside is very good, Bose did all the interior for Nissan and they have improved the latest model with better sound proofing so less diff and gearbox noise and also upgraded the sound system. Its like a kind of dynamat by bose under everything. I guess the only thing that is a little annoying is the road noise from the run flats. I will sort out some better pictures and eventually gopro video.