Not that interested in CarPlay at the moment (plus they are much more expensive), and I want the 60GB capacity of my iPod, plus the 717 fits in the dash without brackets or extra cables, including steering wheel controls. Adding the extras to the cost of the 4017 almost brings it up to the price of the custom fit 717. Also, the 717 has the volume controls on the correct (right) side of the unit!
I have just found the older version of the 717, called, surprisingly the DDX616WBT and it's available for over $100 less and does all I need! It also (according to the Kenwood list) can connect to tmy iPod.
I suspect the Toyota-specific 717/917 and the older 616 models are only available in Japan, Australia and SE Asia.