I put mine on last weekend and have a few hundred miles on my 2011. No issues at all. Actually the best fit of any bike i have put the pazzo levers on. No difference in Quickshifter.
Street- 2011 BMW S1000RR with ABS, TC, and Race Assist. BMW Akrapovic Slip on exhaust, Full Ohlins suspension, BMC Race Filter, Pazzo Racing Levers, Yoshimura Case Protectors, Stomp tank Pads, Puig Windscreen, Frame Sliders and Fender eliminator
Track- 2008 GSXR 1000 with 194 RWHP, Racetech Suspension, full Bazzaz Package, etc.