I think some of you need to be reminded that CPO does not mean perfect car. It's still an used car that someone may have had issues with. My E92 that I traded in was sold last week and was CPO'ed. That car had quite a few software issues as other minor things. The new owner is now inheriting those. You are doing the same. You do have BMW backing you. In a brief moment of stupidity, I considered buying a CPO 2009 550i that was at my dealership. These exact same points flashed through my head. Even though it was a great deal , it's still an used car.

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2013 X5 Xdrive35i Premium
2013 F30 328i
2004 Mustang GT Very Modded...