What ROM are you running? That's the biggest question.
It shouldn't matter Which BT headset your using, as there is a known problem with *SOME* phones and/or software combinations. I myself have used 3 different BT headsets, BT GPS, and sync to my computer with BT and I have never encountered any of the problems that are touted on the boards.
I also have the same Motorola headset as you BTW.
My suggestion is to try the newest Stock ROM for your carrier with No software installed. Test the Headset and see if it works... if you still have problems then we can talk about your choices (Exchange phone, different drivers, etc)
phaZed
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