TechPowerUp published a review on the Pwnage StormBreaker
A quote from the article:
Made of Magnesium, the right-handed ergonomic StormBreaker is exceptionally light at just 51 g. Another novelty is the sensor position being adjustable to one's liking. In addition, it comes with PixArt's PAW3395 sensor, Omron switches for the main buttons, 4000 Hz wireless polling, and up to 120 hours of battery life.Pwnage StormBreaker Review