I have ordered the combo, and my reasoning is simple - I promised myself that my next car would have a heated front screen after suffering quite bad misting issues in my Mk5 when cold or very wet. Not to mention quickly and efficiently clearing ice.
I almost cancelled/delayed my GTI order based on rumours the Golf would be getting such a screen. It's one of those things that I know if I left it off the list, I'd be kicking myself as soon as the time comes when I would have really benefited from having it. I'm also keeping my car for a good number of years, so the last thing I want is for it to not be right and have to live with regret. Nor do I have a garage so the car is always out!
I'm in the same boot as you, I have an iPhone, and have little use for the advanced features even if it were compatible. I rarely use my phone in the car as it is anyway. But, I understand the radiation-blocking potential of the screen and so OK, rightly or wrongly it is what it is. I'm not happy it costs so much in total, but I'm very happy that I have it. I just look at it like this - 19" wheels cost almost a grand, and leather costs around £1,700 I think. Neither of which perform any real function other than cosmetic. Every single option I've chosen has a genuinely useful function either all year or when it's cold.
As for the button, not sure whether it's a separate one like they have in the Fords, or just linked to the rear heater switch. Not fussed either way to be honest as long as it's effective!
