I have IDrive but I prefer to use the front USB connection (with a regular cable). I don't want to run my Iphone5 all the time on Bluetooth just for music, and the glovebox USB/hard drive option seems like just an additional step I don't need. Although it would have the benefit of not having an Ipod hanging out...maybe I'll try it. I don't worry about leaving the Ipod out though - I really don't think that's a big theft item at this point.
Have to admit I don't know much about Pandora - it's a subscription service, right? So it exists as an app on your phone, and then you stream it through the phone into the X1 audio?