I have been reading mixed feelings about the mic that comes with the X930BT. I was wondering if there are alternate mic options that can be used with this system, or does it have to be the mic that comes with the unit.

I'm sure you can get a mic to use since the connection is pretty standard. Not sure where you would source one though. I put the sponge from a headset boom mic on mine and that seems to filter out some of my background noise.

well as talked about hundreds of times, any mic with a 2.5mm connector should work, people have used mics from garmin and parrot before