Just got my Ghibli that I ordered in early March with B&W. The SD card seems like the best option, and after some searching around I figured out how to make it work really well with iTunes. The documentation is really poor, so for those who are interested, I did two things to get it to work:
1) Install and enable BlueHarvest (see link at the top of this thread).
2) Copy the entire "Music" sub-folder from the Music/iTunes/iTunes Media folder from my laptop that synchs with my phone into the root directory of the SD card.
3) Insert the SD card and wait a few minutes for it to build the catalog.
Once it's done, the music is organized as in iTunes, by Artist/Album/Song (in that order), and everything maps perfectly in the MTC UI. Initial reaction is that the sound quality is much better using either of the SD card or USB cable than it is with Bluetooth.
Hope this is helpful for those struggling with the doc as I was…