I had no need for the NAV (my smartphone does just fine) but I really wanted iDrive for the ease of menu access, MP3 folder navigation, etc. If I could have gotten iDrive without NAV, I would have.
Current: BMW Welt Delivery 4/14/16:
European Delivery - 2016 340i EBII/Saddle - ZMP | ZCW | ZDA | ZLP | ZTP | M Adaptive | Rear Shades | MPPSK Before and After Dyno
2011 335D Space Grey/Black - ZSP | ZPP | ZCW | 6FL | Sat Radio | Nav | $600 Base Audio Upgrade