Do you guys think that the new rMBP pro is worth spending extra money over getting a 2014 at a discount of $200 or a refurbished at $400 off. From what I can tell, the only material feature that is different is the ability to use a 4K monitor. I don't mind spending the extra cash if there was enough of a difference. Such as a new model. But, it almost seems they are just a slight bump that i would probably not even realize.