G500. i've used it for over a year now. 100% fine. be sure to use it on a mouse pad though ^_^
g500 uses laser. But, never once have I had an issue with it not responding.
This is my grip http://assets.razerzone.com/peripherals-guide/mouse/images/palmgrip-illus01.jpg i use the palm grip, im just wondering because ive heard things about the laser on the g500 right now i just have a regular old microsoft mouse im not sure if it is laser or optical? is optiac the ball? because it doesn't have a ball