Almost-automatic driving is dangerous. There's a "deadly valley" which begins at the point where the driver starts to no longer pay attention. It ends when the automation is good enough that the driver doesn't
need to pay attention. Between those two limits lies trouble.
The major vehicle manufacturers which have shipped driver assistant systems have put in controls that insist the driver pay attention. Mercedes, BMW, Tesla, and Ford check for hands-on-wheel.[1] They're desperately trying to stay out of the deadly valley.
Here's the problem with that.[2]
Volvo, and maybe BMW, have a second problem - too many modes and too many options. There are lots of semi-auto options available, and they may or may not be installed on any given vehicle. Here's what happened with someone who ordered self-parking without buying the "pedestrian detection" option.[3] Bad idea selling that option combination. It's been a learning experience for Volvo.
[1] http://www.greencarcongress.com/2015/07/20150713-eclass.html
[2] http://www.dailymail.co.uk/news/article-2903692/Warning-reck...
[3] http://fusion.net/story/139703/self-parking-car-accident-no-...