Quote Originally Posted by Jetta5 View Post
I was considering the MDI interface as well, but was put off when I got the quote... can't remember exactly what it was though. I remember I was expecting around $270, but I think the quote through my dealer was around double that. Maybe you will get offered a better price - or you could try elsewhere.

I decided that I wanted to upgrade to the RCD510 instead (and use an SD card). One significant problem with the RCD310 and a large MP3 collection is the unit's single line display and having to scroll through one item at a time.
I have the RCD510 with the MDI, I so far have used both the iPod and USB connections and they operate seamlessly with all music info etc.. I have yet to use a SD card however I would imagine it would be same provided you have the same information on the card as the other two devices.