i paired the iphone6s to my pioneer HU this am (AVH-2500BT, same gut as the 4500BT i run in my G and Z). handsfree is fine, and bluetooth streaming works, but obviously not pandora since it will need to be hardwired.
but anyway, im happy dat the screen at least shows the track info (less artwork) and i can still skip the track from my steering wheel. also im happy dat pandora can easily be started from my phone with a bottom up swipe. for the Fit, this is plenty.
however i did notice that the audio quality of the iphone over BT sounds flimsy vs my old droid4.
which is also fine for the Fit.