Just ordered it for my SR+. Primary attraction was the AP lane change. I find it very disconcerting and even sometimes dangerous when I have to disable AP, change lanes, then forget to re-enable and then forget that it isnt enabled.
What a ridiculous run-around to buy it though. First a call to support who told me to call sales who then put me through to parts who were finally able to do it for me after telling me that I should be able to do it on the website. All with long waits of 5-20 minutes before answering.
The website of course just comes up with an error when trying to access AP options.