I would like to get feedback on anyone's experience with bluetooth intercoms. Right now I have a Blue Ant BT passenger-driver intercom that works well and can connect to a cell phone if needed. The unit has two shortcomings -- I can't get GPS directions and I can't play tunes from my iPhone/iPod. I had all of that with my Autocom unit, but the wires were an unacceptable nuisance. Sena, Cardio and Intercom (Blue Ant) all have 4th generation units. Before taking the plunge to buy one of these units, I'd like to get others' experience.