The answer to "is he real or is he Memorex?" is relatively simple - and the answer is "REAL."
Why? Easy, because Trump has never operated in a political environment. Oh, he's dealt with politicians, but that's different (while bringing in some useful skills). He has ONLY dealt in a brutally-competitive market, maybe one of the most brutal and competitive, that of the NYC real estate market. There are few compromises - you either make the deal or you don't. Yes, there are some compromises, but there's ALWAYS competition - and especially in New York nobody gives a damn if the other guy's feelings are hurt (I think that you could easily test the veracity of that statement with what Trump has said). Trump has played to win for 50 years, and has done so exceptionally well. Yeah, he has some failures, welcome to the world of capitalism - NO ONE succeeds all the time, not Trump, Buffet, Gates, Rockefeller, Carnagie, J.P. Morgan - NO ONE. After 50 years of operating in a particular way, and having to answer to no one, he isn't going to change...except that now he'll be working for the country and not his own wallet.
For those arguing that he is just doing it to line his pockets, I say that he is decades beyond needing to do that - and the man has kids and grandkids that he wants to see have a real country in which to live. He's doing it for them, not himself, and we all get to go along for the ride.
I buy your take totally. The hard nosed Manhattan businessman is precisely what Cruz was describing.