I have one, and it is quite effective, and quite unobtrusive on the bike. However, it is not as easy to engage and disengage as the manufacturer would lead you to believe. Installation is easy, once you figure out how to get the inner bar end weight parts out, which required two very small flat blade scewdrivers and some swearing. If you get one before Balranald, bring it along and the drunks can help you fit it. If you don't get one before Balranald, take my ST for a spin and try it out.