I switched from my Logi MX510 to a Razer Copperhead many years ago, it had a significant improvement on my skill (laugh it up now), though it did take some getting used to (the copperhead is pretty tiny compared to most logis). I'm actually considering getting a new gaming mouse as the copperhead is almost too small (and I like to buy stuff)
I'm still using my Mx510 though, actually using it right now here at work. What a tank!