Similar, but from what I've read, Tesla did it better. I think this was the comparison I was thinking of in particular:

http://www.caranddriver.com/features/semi-autonomous-cars-co...

I chalked some of the differences to being more defensive than AP

For example, I'd be surprised if you took one of those competing systems to "fail road" and it started to veer the way Tesla's system does instead of disengaging