I currently own a Jawbone with the metal ear piece, I works OK in my CRD (running ORM) and most rental cars as long as I don't have a Desk Jockey with a soft voice who doesn't want to wake up any light sleepers in the next office cubical. Add in a noisy road or a working piece of construction equipment and I can not hear them.
Is this headset any good: Motor Trend MAX 4X Bluetooth Headset ?

I appreciate the reviews of the over 50 year old members, ORT drivers, other diesel drivers, and Combat Veterans who do not have Bionic Hearing that can hear a pin drop next to an F-15E take off .
The advertising reviews and hype is more useless than Negative Political Adds.

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2006 Pearl Green CRD
Magnaflow 2 1/2" Cat Back
KJ Extra Leg Room Brackets, Carter Lift Pump, V6 Airbox, ORM
Fuel cooler, Oil Separator, Progard 7
Gauges EGT Boost Trans Temp Oil Pres, Michelin LXT AT2 245 70 R16
7,000# Draw Tight hitch, PML EX Deep Trans Pan
Centrifuge, SunCoast, Transgo, RAM TCM, InMotion Stage 2
Wife's 99 TDI VW Beetle

I use a Motorola 375 with my Blackberry Curve and it works fine on the road. My hearing is bad from working in a garage on trucks and heavy equipment for many years. When the noise in the garage is too much, going outside the bay door works fine.

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2006 Black Jeep Liberty CRD Limited
K&N, Samco Hoses, Michelin 245/70-16 LTX A/T2, Fumoto F-102, V-Force Muffler, Mopar, Hitch, Trailer Wiring, Skid Plates, Slush Mats, Rear Shelf, Predator Stage 1, Transgo, ORM & CodeReader, Facet 40109 Pump
"IT'S A DIESEL THING, YOU WOULDN'T UNDERSTAND"
Certified Services Auto & Truck Repair