It depends on the bike too. I tried a crampbuster but the 'busa has such a short throw that it proved to be useless and even a bit annoying. I also tried the rubber grommet on the edge of the throttle between it and the bar end. It generally worked but it wouldn't always keep the throttle in position, especially when colder. I finally got the Throttlemeister and it works just perfectly for me. I keep a couple of fingers on the throttle and use my little/ring finger to tighten it, once friction is in place, I just reach over and finish tightening it down. It does take a little practice to get it going but even when new to it, you can pull in on the clutch and coast, then just take your hand off the throttle, tighten it down and roll back on again.
Carl