With tracers on, I find myself watching the tracers and almost trying to match the stream with the target -- i almost dont see the gunsight eeven when I'm trying to. Since I've had them off, I am subconciously watching the reticule and actually aiming . I've seen a big jump in hit%, and my first burst is more on target too.
Dred, you make a good point -- but I dont think most people have adjusted their sounds as extremely as you have. I turn engine down, and I'll hear enemies sometimes -- but usally they're too far into range for the sound to ahve been the give away. Less savvy players may not have adjusted sounds from default at all -- and those are the ones most likely to be surprised anyway, since SA is one of the harder things to pick up. So, tracers off definitely gives more time to adjust aim in general, at least in my experience.And, with a half to 1 sec burst kill time,. even a little dealy in reaction can give a kill -- tracesr are much more attention grabbing than an airplane sound...