Supercruise...anyone using it all the time?

Thinking very hard about the super cruise...I have a use case for it but don't get to test drive it. Dealers here refuse to take trucks on the fwy. I am also told that for super cruise to work onstar needs to be activated and that is only done with the new owner. I think onstar has a demo mode but oh well, maybe salesman just don't wanna deal with it.

Anyways, anyone here who can speak very highly (or lowly) of the super cruise?