TechPowerUp posted a review on the SteelSeries Sensei 310
A quote from the article:
The Sensei 310 is the newest iteration of the legendary Sensei. SteelSeries upgraded the product with a new sensor they call "TrueMove3", and a new design where the main buttons aren't part of the main shell. At $59.99, it comes in at a reasonable price; let's look at the performance and quality it delivers.SteelSeries Sensei 310 @ TechPowerUp