I swear by the logitech g600. I literally tried all the big name mice out there, I HATE RAZER, i had a naga, naga chroma, and death adder, all 3 crapped out within 6 months to 1 year...also the synapse software is annoying as hell.
g600 is the best mouse ever, my g600 is going strong for 2 years now, the button clicks still feel amazing, and it has not even once caused any hesitation or problems (unless i go over a cookie crumb or something, but thats not the mouse's fault) - also i am not a huge logitech fan, but the g600 mouse and g105 keyboard are the bees knees (personalyl don't like mechanical keyboards but the g105 is NOT your typical membrane, and its <3 and with the logitech Gaming software the 2 work seamlessly together. Most people would consider me a "hardcore" swtor player, and i use the g600 and g105 and it just feels like silky, seamless awesomeness.
the g600 is the best mouse of all time also imo cus i like how all the buttons are right under my thumb, rather than in all kinda of crazy angles scattered all over the mouse.