The prices seem really high for a 2 year old car/truck. Another thing to consider is that as a demo that car has had a pretty brutal life for quite some time. It never had a proper break in and was punished on test drives while still cold. I would not purchase if you intend on holding for another 250k (I would never plan on buying an f10 for that long anyway- it will be a fortune to maintain).
2013 SL63 AMG black....
2012 750IL x drive, imperial blue/oyster, a finely loaded beater car...
2010 Escalade ESV Platinum
2012 650 Cabriolet M sport (gone)
2011 550ix (gone)