Originally Posted by rodimus
If your key is already in the ignition to unlock the steering wheel why not just give it a turn, I'm pretty sure that will turn your car on too. Lol

I agree. The whole point is to be able to walk up to your car, jump in and push the button leaving the fob in your pocket.
I've rented a number of Nisson's that have this and it is a really cool feature.
With the XF if you have to insert the key anyway, it is a waste of time and money.