Concur with Watcher. I put my first one on a 2004 Honda ST1300, and worked so well, I knew I couldn't be without it on the Rocket.
Just before I made the decision to sell the ST1300, the by-then ten-year-old McCruise unit quit working. There were a number of calls back and forth to get it working again, needed a part and he had one available in South Carolina of all places, and got it running.
Installation is fully supported, with a multi-page installation guide, written in English, and abundantly illustrated with photos of the installation on THE bike. And given the Rocket's available power, in responds "effortlessly" to the cruise control's commands making for a smooth ride and luxury of stretching both wrists. In addition the installation guide, there is a hefty operating guide complete with ample trouble-shooting. Truly professional. Worth every penny, if you have the pennies.