I've had the Blue Ant Z9 and was disappointed. It was not loud enough in a (high-end-of-market) car on an interstate highway at 75 mph w/ windows up and A/C or heater on. I've since tried two Jabra bluetooth units and they're worse. I have been wrestling with the idea of buying the BlueParrott B250, myself, just to get a device loud enough to be used in a car at highway speeds.
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