I have just returned from a trip to Bathurst on my TDM. All up about 3,000 kays using the Go Cruise plastic cruise control that clips around the throttle and rests on the front brake lever. It was fantastic, except I broke one trying to adjust it. Fortunately, I had a spare. They are the duck's nuts; I even use them through towns to keep the speed steady, but they are fragile, and cost $25.
I was just looking in the vendors section and found this:
For less that $50 delivered (with the ADV discount) I reckon it's a bargain.
I'll let you know how it works when I get it.