TechPowerUp posted a review on the Gigabyte XM300
A quote from the article:
The XM300 is Gigabyte's take on an RGB gaming mouse. It keeps the low price point Gigabyte's other mice have, but offers very impressive specifications with Omron switches, an optical sensor, and, of course, RGB lighting, a steal for just 40 bucks.Gigabyte XM300 @ techPowerUp