I had Throttlemeisters on two bikes, a BMW GS and my 07 Rocket Classic and ridden all over the country on both bikes. They are the next best thing to a cruise control and worked just fine for me. They allow the rider to rest the right hand or relieve cramping while maintaining speed. I set mine on with slight friction so that I can tweak the throttle with the fingertips when needed. It was especially effective on the Rocket because with their torque and HP they don't loose speed with slight inclines.
My son gave me a Kaoko for my VStrom DL650 and while the principal was the same it had a more handy knurled knob for setting and adjusting speed. There were times when riding in the rain that I had a difficult time getting a firm grip on the smooth surface of the Throttlemeister, not so with the Kaoko. Now Throttlemeister also offers a slotted bar end unit for better grip.
The previous owner of my Touring had the cruise control installed. If I didn't have it I'd be installing one of them. Kaoko makes one for the Rocket as does Throttlemeister. The Kaoko is made in South Africa.
Kaoko Throttle Lock Triumph Rocket III - RevZilla
Home - Throttlemeister
IMHO, if you don't want to spend the money on the cruise control, go with either one and I don't think you'll regret it.
Oh and this is what you will have with the cruise control, a hang on controller that I don't particularly care for but it works. The module is mounted under the bike on the right side next to the engine. Claviger located it while he was over downloading the tune on my Touring.