I just had a Pioneer SPH-DA120 installed in my Roadster Sport, replacing an old Kenwood head unit. It really transformed the experience in my car - it feels much more like the Model S center pad, but in a Roadster form factor. People can hear me on calls much better with the mic from the Pioneer and calls sound a lot clearer. The GPS implementation is a lot better through Apple Maps (though I do wish I could use Google Maps instead) than through the Garmin Maps in the old Kenwood (and they are always up to date). Listening to music is a lot easier (although I wish the Pioneer had a better implementation of album art). The Siri stuff helps me stay hands-free too by reading messages and with voice transcription. In all, I'm really happier driving the Roadster with this head unit.