I would order without a doubt. I have a 997S in the UK and use it a lot! Also got a BMW 330 coupe and this doesn't have one and I find it a pain in traffic when it is raining. Yes the screen does clear slightly in the 997 without the wiper at speed but in traffic I think it is dangerous not to be able to see properly. Also when reversing it is difficult to see if you can't clear the screen.

Just my opinion!