I went with the Kuryakyn 6218 Thumb/Throttle Cruise Assist Premier from eBay for $30. I had the Vista Cruise universal lock on my previous bike, but I never liked it appearance. This one has a more sleep appearance. Installation went well. There is a little chrome flare piece on the inside of the throttle grip. Because of this I needed to shave the edge of the rubber friction ring insert to match the curvature...this to get the unit as close to the inside as possible. Squeezing the rubber was difficult at first. I tried to lubricate with some dish detergent at first, but got better results from Vaseline. I had to use the little plastic stretcher piece to span from the grip to the handlebar. It is pretty easy to use and does a good job. It feels like I have to stretch my thumb further than what is comfortable to operate the lock/unlock. I don't use it often, but the more I use it, the more comfortable I feel with it.