My favorite surprise was that PDC gave the cool display in iDrive when reversing. I bet it was somewhere in the options lit, but I missed it and it really made me like rear PDC. I thought it was a silly option, despite being pretty inexpensive, but the rear 'radar' display rocks. I'm a good parallell parker and don't need it at all, but I dig the display when reversing out of tech-fetish. I wish all of the careless a$$holes that have backed into my cars over the years had it. Three new hoods in five years on my last car due to back-up dammage where the hood curves down to the kidneys!
Next cool feature was the auto-drying brakes when I left a car wash... awesome little detail.