The k3's dont last that long and they are classified as a medium compound. they have a k2 and k1 that are softer. I used several sets of k3's so far and now am using the Bridgestone BT-003 RS tires and they are MUCH better for far less cost($300 a set)
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.