I too have been extremely impressed with SAS, as I have the GTPPrix triple gauges and their service and support have been TOP NOTCH!
May I ask what Bluetooth they wound up installing into the car? Was it a visor-mounted one like the Parrot or Moto t505 (which is what I have currently) or something else?
I don't think it's possible to retrofit a 2009.1 (old stock) car with the GM stock 2009.5 onstar+bluetooth system.
Please let us know.