Please, if you're going to try it, keep both hands on the wheel and your foot ready for the brake. When it goes off the rails, it usually does so in surprising ways with little warning and little time to correct. And since it's so good much of the time, you can get lulled into complacence.
I never really understand the comments from people who think it's the greatest thing ever and makes their drive less stressful. Does the opposite for me. Entertaining but exhausting to supervise.