I just returned from a 2600 mile road trip in my 2014 P85D. The car drove 95% of the miles in Autosteer. I've learned to spot where the AP will likely have trouble and I need to be ready to take over, but even in these early days it's remarkably capable, and it has gotten noticeably better since the 7.0 release date. I'll be even happier when the car learns not to dive toward random highway exits.