Hi there,
Ok this is where I plug the MCCruise:
MCCruise Website
Now obviously it's going to cost more than any other solutions out there but if you want REAL cruise control then it's the solution. Very well constructed and the kit is surprisingly easy to install. I did it as a winter project.
I didn't like any of the clamp/twist style because I had just gotten rid of the Ultra Classic and really enjoyed the cruise on it.
If you're interested in buying one talk with their US distributor Joe Sears.
Spoiled Biker.com
Here's my write up on the MCCruise:
MCCruise Install Tutorial Supplemental
So if you need a real cruise I think it's the easiest one to install overall. The actuator does stick out a little under the left side panel but honestly there isn't a lot of room for it. It's black though so it doesn't stick out that much. Personally I didn't care about how it looked too much. I wanted the full functioning cruise.
Curt