I bought and installed a Parrot bluetooth kit about a year ago.
What a waste of time & money.
Initially I had the mike in the place left in the cluster, nobody could hear me, but everyone liked the engine noise they heard
Then I moved the mike on top of the rev-meter, a little better but would work MAYBE if the top is up. Lots of trial and error and eventually i threw it out again.
I don't think that bluetooth handsfree and convertibles mix well
Oh yes and the Parrot is supposed to work through the car-speakers, well it WOULD work if you would feed the speakers from the head-unit and had no amp, which - of course - is not the case.
So I had to do a lot of cable splicing and soldering to at least get it work with the speakers but then no volume at all.