Sure is Pete, very cool and freaky as said especially the first time you use it - the wait to see if it brakes and stops the car LOL, had me in a cold sweat first time it breaked from 100-0km/h after a Freeway run after encountering road works...it all worked as though I was driving
Thereafter re-starting (which is an input the driver has to do) but all you need do is tap the accelerator and then the automatic driving takes over again adjusting it's speed, distance, slowing down, re-accelerating, stopping etc. to fit in with what other vehicles around you are doing just like as you would normally do yourself...
I've gotten so used to it, I hardly ever drive manually anymore on Freeway runs, whereas before with other cars I hardly ever used cruise control, but this set up in the Merc which actually takes over entirely (except for the re-start from fully stoped) is so complete it makes a World of difference and if you get lazy and fall asleep, it's got a built in drivers safety package features that'll quickly slow down and stop the car and wake you up too