I am very pleased with the Bose system that came with my '12 Touring. Plays the ipod and mp3's very nicely. The system will not blow you away like a Mark Levenson but it will give you a very clean sound and a good amount of bass with no distortion.
I'm sure there are many people that would rather use the difference in cost for an aftermarket system and can make it sound even better than the Bose.
But as for me I like things stock and dont want to deal with sending the car into stereo shops. Just keeping it simple.
The heated leather seats gives the Z car a little bit of lux!
So for a two seater car this small the Bose system sounds great IMO!