Ian,
I've got mixed news for you I'm afraid. I have the RCD500 6disc plus 'soundpack' and I have some big issues with it. I took delivery last week and straight away I was indoors to find some good cds etc (I like my music and felt the extra dough was worth spending - though I couldn't find a dealer that really knew what the hell it was!).
The good news is that what you are getting is definitely an uprated amp or amps and perhaps some more hefty speakers. The bad news is that (in my car) the doors are unable to 'take it' and something major seems to be vibrating with the bass (not turned to max - just left on std, right in the middle) which is driving me mad and making unhappy
. If it only happened when the volume levels were high etc etc - I could maybe forgive it. I'm getting the vibration at even fairly low levels. (The main problem is with the drivers door)
The car went to a dealer on Monday (not even a week old) to have it sorted. At lunchtime - I get the 'we can't make it do that' call (which can be translates as 'we don't want to bother with this job, its warranty work and we only get a pittance from VW for our efforts, which are more profitably served undertaking prime work')
The story is not finished yet - and I would be very interested to hear from you with regards to any similar problems you might have.
Regards