Is the High Performance Sound system really that bad? I've read other posts about people wanting to upgrade their high performance sound system because they were not satissfied with it. I tested it BRIEFLY before I placed my order and I think it sounded decent enough so I decided to avoid the price tag of the premium sound because I really didn't wanted nav. I haven't taken delivery on my RD yet (ETA mid November) and now I'm second guessing my choice. I'm not asking for comparisons between both systems. Obviously the premium sound system sounds better, no question about it. What I would like to know is your opinion on the high performance sound system. What do you think? Do you think it's that bad that it should be or needs to be upgraded?