I rent cars all the time, and use every feature available. I find the driver assist features to be interesting but not infallible. Each car model is different. They are getting better, especially in the last year or two. Some constantly weave back and forth within the lane, which kept me awake especially when traffic is nearby, this is particularly scary on roads with oncomming traffic. Others are smoother but experience a "DUH" moment when the lane line just dissapears at an exit. Most will try to take every friggin exit - it's amlost comical. Most seem uncomfortable going in a straight line and need a line to hover near. None anticipate curves by looking ahead like my driving instructor taught. Most give you a bag of shit when you take your hand off the wheel (but who would EVER DO THAT???) Could it keep me alive if I drifted off or got distracted? Yes. Should I plan to be distracted or sleepy? NO.
My general take is that "autopilot" is poorly suited to your typical half-assed USA drivers who text, yell, comb, sip, read, snooze, get lost, have poor eyesight, go too fast, go too slow, tailgate, apply lipstick, play with their guns, search for buttons, wear high heels, drink, light cigarettes, pour hot coffee in their laps, flick ashed, play music for their neighbors (shall I go on???). It is at best a poor marketing gimmick and at worst a method of suicide by car. I'd say that your average driver who is at best marginally capable of reading signs and is currently driving distracted anyway won't be improved by lane assist but the better cruise control will help us all.
Adaptive cruise control was more consistent and useful, I have high hopes for this feature improving traffic flow in congested areas.
Oh ya - if you can't park or back your boat trailer, you should have your license revoked.
