The first day I brought my ST home, I got a Powertrain Malfunction. I brought it back to dealership and they didn't know what was wrong, but they reset the code, and sent the info to Ford engineers. A couple days later, I got the same Powertrain Malfunction, and brought it back to the dealership. They gave me a rental, and said they would work on the problem. A couple weeks go by, and they initially said they couldn't find anything wrong, and waiting to hear back from Ford engineers. Talked to service manager, who said he would give a test drive and if he couldn't reproduce the fault, they'd give it back while waiting to hear from Ford. He was able to reproduce the fault and said I needed a new transmission. Fast forward a couple weeks, and they tell me they're still waiting on Ford to ship the new transmission.
About a month goes by, and they're still waiting on the trans, and have no idea how long it will take. So, considering the dealership had my car for almost 6 weeks, and had no idea when I'd get it back, I decided to start the process of Ford buying back my ST. 3 weeks later, Ford denies my request. I talk to the service manager, who tells me Ford finally shipped the trans, but it was defective out of the box, and they are going to appeal Ford's decision on my behalf. The next day Ford calls me and now are approving the buyback. Now, I'm in the middle of the process, Ford has all the documentation they need, and they tell me it will take 3 to 4 weeks to complete the process.
And that's where I'm at right now. About 1 week into the 3 to 4 week process.
I'm planning on waiting until the 2021 because we are so close to the new model year, and I'm leasing, I'd rather have a new model year, then the end of a model year.