I recieved this mouse today as a replacement for my faulty Corsiar M65 Ultra Wireless. My first impressions are that it's okay. It feels plasticky and a little flimsy. The side buttons have a nice click and feel solid, the main left and right click feel a little light and flimsy but work fine. The scroll wheel though, feels horrible. It rattles when you scroll and when you middle click, it feels horribly mushy and wiggles to the left. It feels like a scroll wheel that you would get on a $20 mouse, not a mouse that has an RRP of $349.99. It's honestly pretty disappointing. I have a logitech G402 that I use at work and the scroll wheel on that mouse feels 1000× times more solid and premium both for middle click and scrolling. I am baffled that Logitech put this horribly cheap scroll wheel in this mouse. My initial impression is that while the mouse works fine, it feels miles cheaper than the Corsair M65 Ultra did. I would avoid this mouse if I were you, simply because of the scroll wheel.