What are the sliders for? My bar-end mirrors screw into a threaded plug inside the bars. Do the sliders offer an advantage over that?
.
There are a few reasons I put them on. First, being barend weights, they cut down on any vibration in the clip-ons. Although I ride with pretty light hands and that doesn't usually pose a problem, it can begin to affect me when I do 300-400 mile rides. As I'm sure you know, given that vibration can cause mirrors to be rendered less helpful, these help with that too. Of course, CRGs are generally not prone to vibration troubles. Second, were I to go down, they are designed to protect the bike from damage (which may be small, but can make a difference, e.g., to the tank). I also like them because they put the CRGs just a bit further out such that my hands don't bump into mirror mount. Otherwise, they're just a taste preference.