I had the option checked when I was making the order. But it put the car just over my budget so I lost comfort access and had heated seats instead. Dont regret heated seats but wished id ordered Comfort access and DAB!
A friend has the 635d and loves being able to start the car whilst leaving the key in his pocket. Very handy if you have numerous other keys attached to the ring which makes it hard to get out of your pocket whilst sitting down.