It's been a year since buying the GP sedan. After the first 10,000 mi with zero problems, it is clear that if GM could build all of their cars this well...
Zoom. The engine is great, what else would you expect from the 3.8L? Controls are placed nicely for the driver, but not the passenger.
Woe is my back. Other comments about the seat being wonderful have not been borne out in my experience. It is impossible to find a comfortable position with the "wrap around" seatback which has two prominent side bolsters (both in the wrong place) that cannot be adjusted. Ouuuuch.