I had the G500, the sensor isn't the best, it has acceleration that you can't remove and it was too heavy for my taste, even without the weights.
I got rid of it for a Logitech G400 with fixed prediction.

This mouse allowed me to reach the top 1% in the world in BF3 with headshots, I'd say that's good enough.
Oh and it doesn't have a braided cord, yay no more snagging and fraying.
I had 2 DAs, both arrived DOA, I had a Steelseries Sensei, was also DOA.
The Rat uses the Phillips Twin-Eye sensor, which is a pile of crap.
The Zowie AM, G400, DA, SS Kana, and SS Sensei [Raw/MLG imo] are some of the best mice to be released in the last few years.