I am having a hard time with the idea that mouse polling rates can be a "game changer" as it were. Ok, so @ 500mhz, your mouse will "refresh" its connection to your computer every 2 milliseconds as opposed to every 8 milliseconds. Faster, yes- but probably far more meaningful for mouse "movement" (as in shooting games) than mouse "clicking" (as in trying to ding the meter). Higher polling rates also increase CPU usage. If you go to a mouse polling rate test site such as:
http://zowie.benq.com/en/support/mouse-rate-checker.html
you will notice almost no reading when you click- but a full reading when you "move" the mouse.
Also, the total "latency" of any gaming experience (ie total "reaction time") is a combination of mouse, monitor, and human response time, plus internet connection latency (ping). So even at 144hz monitor, 500 ms mouse polling, say 12 ms internet latency (really good), you get:
2ms + 7 ms+ 250 ms+ 12 ms= 271 milliseconds delay between when your brain says "click", and the instant your meter stops on its way. That is a quarter of a second.
If you are good at "dinging" (or off ding at will) then you have good muscle memory with the ability to "time" the delay from approaching your desired "stop point" to click approx. a 1/4 second "early". I have my doubts a faster polling or refresh rate is a significant factor in making you "better", however a smoother meter from whatever changes (and there are MANY possible changes) is always helpful.