Should have specced it in the first place 
Get it. You know you'll be forever wondering 'what if' if you don't 
Its just so hard to take the plunge though. It adds a grand, and really if you go for it how can you then not get DCC? Its the same argument so you can't really go for one and then reject the other.
Just can't bring myself to do it. £1750 extra? I could afford it but not on a whim. The thing is, if you go for it then I honestly believe you'll never really *know*. Especially in my case where this will be my first GTI, having the stock car is gonna be an experience enough, getting a better than stock GTI won't mean anything to me because I don't know what stock is. I've got no reference point.
Always wondering "what if"? Well, I guess you just have to not be thinking that way.
Lower resale value? I said it before, if I choose the car to maximise resell I would pick completely different options to the ones I did. I want to drive the car I like the most, not the one the guy who I may or may not eventually sell to likes the most.
I guess I'm 60% in favour of no PP, and 40% in favour of PP... but for all the above reasons I just can't swing it in PPs favour!
EDIT:
Would love to test drive 2 GTIs, one with PP and DCC, one without. But there's a twist. I don't want to know which is which before I drive them.
I think there is a strong possibility that knowing which is which before would make you an emphatic believer in PP and DCC after trying it. Not know which is which before might well demonstrate that you can't actually tell any difference between the two.