I live in Orlando. The reasons why I bought a Singer over a S5 or a A7 are
1. Audi cars are a dime a dozen where I live especially Audi SUVs, the only rare Audis are R8 and the RS models that you see once in a while. I have seen 2 Stingers this past 2 years.
2. For a comparable equipped A7, S5 with all the options and toys it will put me into 80,000-90,000 USD and performance wise they are similar
3. The interior of the new A7 has too much screen which will get dirty and oil in your hands will be all over those screens I am old school like my fair amount of buttons. I am amazed at all the technology my GT2 has.
4. The maintenance cost of my Porsche annually is about 2,000 to 3,000 USD plus now they are charging me 3,5000 to change brake discs and pads, I have absolutely the means to pay and 100 times more but I still think is ridiculous what the Germans are charging people for maintenance.
5. My Porsche (which is in the same family of Audis) has given me many problems such as windshield glue melting, headliner sagging due to Florida weather, etc. I had an Audi A6 that had some transmission problems as well and it was a new one 2017, which I sold. My Audi R8 has been discovered to have a chassis problem so when I go into bumps or corners there is a loud cracking and snapping noise comming from the floor of the car, definitely chassis was not put together correctly, all of which are unacceptable for the money paid.
6. My 2017 A6 had premature leather wear and tear, drive the car for only 1 yr and already the leather was sagging on the driver's
seat.
7. Not impressed with dealers from Porsche or Audi, other than free loaner cars there is nothing special about treatment or customer service, its just like any other dealer experience.
8. I have owned Korean cars since 1990 with minimal problems so its not like its my first Korean.
9. My wife's Kia Sedona windshield cleaner tank was perforated for some reason and it was leaking windshield cleaner and the cost of repair total was 90 USD labor included, try to get that done in a German

10. And the most important reason is that THE STINGER GT IS SUCH AN AWESOME CAR<<< This is the bottom line. When I drive my Porsche Cayman S I don't get 2 times excitement over my new GT2 but I paid 2 times more for the Porsche and its maintenance will cost me about 600% more.
Cheers!