not as many problems in the aftermarket stereo world. mainly because these manufacturers rely on having bt connectivity to sell the radio so they make it compatible with anything. also, since these companies dont give a crap about microsoft or apple, it makes their product less susceptible to issues from different changes.
ios 6... it seems with every ios update there have been bt issues. first major one was 4.3.3 then it was 5 then 5.1 and now 6. i have o clue why though
So basically Ford and MS don't give a shit about the Customer having a working product...