Kensington, to its credit, pulled the TB800 from store shelves earlier this year and released a new model, the Expert Mouse Pro TB900 EQ. It’s nearly identical in appearance but promises to eliminate the sensor tracking issue that plagued the old TB800 EQ. Our own Adam Patrick Murray was a fan of the original award-winning TB800 trackball mouse and used it regularly, so who better to evaluate its successor to see how it stacks up? After spending months testing the new TB900 EQ, Adam hopped in front of the camera to showcase the two devices side-by-side and walk you through what’s changed (and what hasn’t) with the latest edition of this comfy, customizable trackball mouse. For more hands-on insights into the latest and greatest hardware make sure to subscribe to PCWorld on YouTube and check out our weekly podcast, The Full Nerd!