Exactly same as mine I got 2 months ago. So far so happy, still can feel my heart beating whenever I see her (strong girl ,top girl). Long time no this kind of feeling. good choice. I feel KDSS really works.
Mine has the same hissing sound also. Today I even noticed when the wind shield wiper move, I feel the vibration transmit to brake pedal, maybe these days I pay too much attention to brake, anyway it is too annoying.... :ybrick: