I have a 2011 Jetta with a bluetooth speaker. It is awful. People say my voice goes in and out. VW claims there's no solution to this problem. At this point I'd like to get whatever bluetooth offers my listeners the most clarity while commuting. I have an iPhone 4s with AT&T. I will spend up to $100 if that's necessary.
Are you looking for a (visor mount) speaker or a headset? Headsets should always give you better transmit audio just by virtue of the working distance of the mic to your mouth. In a noisy vehicle (or with windows down) you want to decrease that distance as much as possible. That's why you see truckers with their full-sized boom mic headsets. Although I've got a truck driver friend who drives a spankin' new Volvo (unbelievable cab) tractor that's quite quiet inside, who uses a $35 Plantronics model that works just fine. I can tell he's in a vehicle but it never obscures his voice.
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