TechPowerUp posted a review on the Zowie S2 Black
A quote from the article:
Zowie's latest offering, the S Series, was initially only available as part of their Divina series, which only came with a glossy coating and either in blue or pink. The S2 Black and S1 Black now make Zowie's newest shape available with their signature black matte coating, which some may prefer. In this review, I'll be taking a look at whether any noteworthy changes have been made to the S2 aside from the coating, along with a detailed comparison with several other Zowie mice.Zowie S2 Black Review
The Zowie S2 is a medium-sized ambidextrous gaming mouse with side buttons on the left side only. It comes equipped with one of Pixart's top optical sensors, the PWM3360, Huano switches for the main buttons, and Zowie's usual no-frills approach for software and lighting, which is why I'll be skipping that part of the review entirely.