When I picked my X3 up last week my CA told me (without me having to even ask) that this was included but that they didn't have it-he got it in the next day, and expedited it to me and I got it yesterday. I got the Nav and premium sound-the nav included (I think...?) the internal harddrive-not sure what that size is, but I spent last night downloading parts of 2 different ipods into the harddrive + about 20 CDs and there is still over 50% capacity left!! Another discovered bonus-even with copied CD's (stuff burned onto generic CD's) this system downloads them and reads/copies all the artist, song information! How cool is that!! My last car had a harddrive like this but on copied CDs it would not do this, so I had 20+ CDs of "unknown artist"..yes I could have gone in and manually imported the info, but I'm too lazy for that...
btw-the premium stereo is simply awesome-