As somecone else said, it is soooo worth it for playing music on your ipod or cd - sound is very clean and crisp. However if you mainly listen to radio, I would not bother. As part of the premium sound package here in Canada, we get satellite radio with the HK system, but as much as I love sat radio for the music sound quality pales in comparison to when I'm playing mp3s off my ipod.....like night and day...
Current: 2012 135i Mineral Grey Metallic/Coral Red/M Sport/7 Speed DCT/PremiumPkg/Premium Sound
Retired: 2012 128i, 1998 318is