I have been running with v-sync on because I only have a 60fps monitor. Today I decided to turn it off. My frame rate according to alt-F was around 120-150, but obviously I was still only displaying 60. I dodn't seem to get any screen tearing or graphical glitches which is good - but I also seemed to be able to hit and kill targets much easier. More of my shots seemed to land - and I got loads more headshot. So....the question is - am I imagining it, or does turning off v-sync if your graphics card can handle much higher frame rates have a real effect on hit registration?