Those crazy crustaceans over at Mad Shrimps have published a review of the SteelSeries Rival 600 gaming mouse that is definitely worth checking out today.
After installing two 4g weights on each side of the mouse, we started gaming in CounterStrike: Global Offensive, Guild Wars 2, Diablo III but also tried a bit of Agents of Mayhem; Rival 600 succeeded to keep the comfort level optimal even 2-3 hours of continuous gaming and during this time we did not spot any erratic movement.
