^^^ Exactly, there have been two or three threads like this. I recall one guy buying the unit made by Conrad-Anderson, a British company. He finally found somebody here in the states to install it and was going to give it a try but never followed up his original thread. My guess would be that it didn't quite live up to the marketing hype. I wasn't overly impressed with the C-A site and the looks of what they were going to be installing.

Here we are, 9 years after the initial release of the Z and still no credible aftermarket cruise control.