When I test drove the Mk VI, the test car didn't have ACC, so I've never felt what it's like. I asked the salesman and he said it wasn't a huge difference to be honest. Nevertheless I ordered it, because the car will have to transport my elderly mother who complains about the bumps almost on a repeating loop.
Some people say it makes a very significant difference, others disagree. I noticed several of the car reviews going on and on about how good it is. So I'll be interested to find out what it's actually like. I'll let you know, next month!
The really interesting bit will be which setting I choose as my own default, when not carrying elderly relatives.
Rolfe.