Well, invoice is going to be about 2-3k under MSRP at that kind of price point. So it sounds they were already trying to ditch it for around what they paid, and you got them to knock another ~2500 or so off.
Sounds like a 2012 leftover being marked down to make room for 2013's. And it was a demo. Better than a loaner, I guess.
If they let you go home to think about it after already agreeing to that kind of price...I bet they'd go lower.
As far as the car...it's nice. I want me some of them automatic brakes.
That's probably electronic brake assist. Plus maybe the little widget that keeps you from rolling into people in traffic (will apply brakes with no input below a certain speed). That would probably annoy me, judging by how much I hate parking alarms (yes, rapid beep, thank you, I'm aware that inconsequential thing off to the side is there). It's definition of 'imminent collision' would probably differ from mine.
One thing I know for sure is sketchy is the BLIS system. Ugh. So many 'functioning as designed; I can do nothing to make it work better' warranty repair write-ups....
But anyway, deal sounds decent. Since it's been sitting around a while, tell them it needs a wax job and a full detail before you'll take it.