I had very high expectations for this mouse and don't normally write reviews at all. However, this mouse is useless. I've been through two of these so far and both have the same issue. As soon as you try to click left or right with the mouse, the cursor follows vertically across the screen, making any precision completely impossible. Something is wrong with this mouse's sensor and I'm going back to my trusty Corsair mouse. I hate being so negative but I want to give everyone some serious feedback so they can avoid this at all costs. UPDATE: The BENGOO seller contacted me personally about my negative review. I'm inclined to change my mind and rate this mouse for its high level of customer service. They have made it clear to me that they have modernized their manufacturing process and are committed to making better products. I'm increasing my rating by one star until our agreement is finalized and I'm giving them one final change. We'll keep you up to date.