He has a very cool and confident demeanor and I think he means business ... one telling sign is how panicked the Cruz-bots have been in attacking him ...
True. They are squealing, so he must be effective.
He views things as they are, "steely eyed detachment," and he speaks with precision. Just adding to your impression, which I agree with. No nonsense, no BS, he won't mislead those he is challenging, his cards will be on the table for the battle at hand.