I was surprised to see Ross Gerber (huge Tesla Bull) say this on twitter, having not tried "Navigate on Autopilot" myself, I wonder what others think?
I drove to Richardson TX and back using basic AutoPilot. It is superior to the Prius TSS-P and significantly offloaded the driving tasks. I use it all the time in traffic and highway. As for Navigate on Autopilot, I have no experience and am waiting for V2 of the hardware. Bob Wilson