I have an eight speed setup that has Sora shifters . I like the thumb buttons a lot for the kind of riding I do. I wanted to change shifters on a bike that has bar end shifters controlling a nine speed Ultegra drive train. I wanted to put Centaur shifters on to convert it to indexed shifting. According to Sheldon Brown a ten speed set of Centaur shifters can be used with the nine speed Ultegra cassette and derailleur with the assistance af a Jtek Shift Mate. If it works I'd be glad to do it. Does anyone have any experience with this type of setup? Thanks in advance.