I have an 07 that doesn't have it, the speakers and sound sucks with any bass trying to come through. Going to swap the speakers eventually.
I did get the Harman with my 13 3.6R. Personally I think it sounds great, good amount of bass. I've read others on here that don't like it and will tell you to get an aftermarket that is cheaper and sound better.
I also owned an 11 Mitsu Ralliart with a rockford fosgate system + 10" sub. The sub was loud, but shook the car and lots of vibrations, the sound quality was still very good, about the same as the Harman. No rattle/vibrations with the Harman system.