I don't know about anybody else, but I have had my Ford 2015 Mustang for less than three months and I have already had significant issues with SYNC and its connection to my phone via Bluetooth. At first it worked great, but then one month after having the car my phone was being disconnected for no reason. First it was just I couldn't play the music from my phone but then it devolved into I couldn't even use my phone for making phone calls using SYNC. I went through all the steps from Ford's website concerning these type of issues and nothing worked. I brought it into the dealership (Murphy Ford in PA) today and we will see if they can fix it. If they send it back without fixing it I'm going to be p*ssed off.
I know this is not the forum for other issues besides SYNC but it should be noted that I also asked them to look at the front quarter panel that has been already coming loose (for no reason at all), probably a fastener came loose. I also asked them to fix my glove compartment because it is extremely difficult to open.
I love my car despite the problems but I must say, I have had this car less than 3 months (4,100 miles on it only) and didn't expect all these little things to be going wrong already. I am afraid of what the future holds based on what I have encountered so far.