Get the premium sound. It is great. Sure you could probably pay less for better aftermarket stuff on your own, but I figured another 2k on top of what I was paying wasn't a big deal.
If you plan on getting some crazy loud exhaust that will drown out all sound, then maybe it's not for you.
'11 BMW E92 ///M3 - ZCP and DCT
'13 Toyota Tundra - 4x4 Platinum CrewMax, 5.7l iForce V8