As a R.A.T 7 owner I have to say - most comfortable mouse ever. But the rubbish Philips Twin Eye sensor in it is a pain. It occasionally falls asleep and fails to wake up, which means I have to restart or replug the mouse. The idea of swapping sensors is a nice touch. Would take an Avago any time of the day. If they also include a polling rate switch - it would be awesome. 1000 MHz polling rate just wastes CPU cycles.