I have used the BrakeAway Cruise control on several bikes, and now on my 2013 Roadster. I really like it. I feel like it's a better option than the friction knob types because of the release mechanism. You can adjust the sensitivity to your liking. There's a release button of course, but also if you touch the brake lever it releases instantly. Put one on my sons FJR 1300 as well for our long X/C to Vegas, and it was worth every penny.
They have been around a long time and they are truly top notch quality machined parts. Takes a couple hours to install and adjust. This is the only pic I found on my computer. I'd take better one but I'm not near the bike just now.
BrakeAway Motorcycle Cruise Control