i HAVE KURYAKIN grips with rubber ridges, this was tight & difficult to put on (w/out rubber insert) and i did not like it for tight maneuvers, city or rides with lots of stops/starts - it is in the way when i need to have ability to vary accelerator by more then std highway same speed stuff....no way to move it out of way, was so cumbersome i pulled them off and threw into wind. (Posted on 10/4/12)
In 2009 I did 11000km across Australia on an R1200GSA. A lot of it was on NT highways at 130km/h. I used a similar device. They take a little while to set up for the speed you want to do but they make riding much easier. (Posted on 7/13/12)
The Crampbuster along with the Go Cruise Throttle Control work great and are inexpensive ways to reduce fatigue.
Regarding reports of slippage, just wrap a rubberband or two between them and the grip. (Posted on 2/4/12)
I love this thing to pieces. It makes it easier to maintain RPMs at a certain range (especially low ranges), which helps when I'm trying to balance the bike at extremely low speeds (no more engine rev blips that make me lose control). This came in especially handy on my last ride, which involved quite a bit of gravel/muddy/watery roads: I was the only one in our scouting team on a standard bike (the rest were on underbones and scooters). Pretty much everyone had to put their feet down at some point when we got to nasty roads. This little piece of plastic helped me control my bike (which is quite unruly, even in the best of times).
Oh, and it also pretty much eliminated cramps for me, too. If you don't have one yet, what are you waiting for? (Posted on 11/8/11)