For a top of the line Buick car has to much cheap interior plastic. Build quality is poor. It hasn't left me stranded but I'm glad I bought an extended warranty. Repairs have cost between $3500 and $4000.
Heads up display. Acceleration for a car of its size is really good. And again for its size it handles very well. I easily get 26 - 27 MPG on the interstate. Around town - 17 mpg.
Get serious about improving overall component and interiour quality. Otherwise it is a great car.