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I really wanted to love this mouse. This style of form factor, with a nice little ledge for your thumb to rest on, doesnt get enough love from mouse OEMs. I also am a contrarian in still liking heavier mice, despite the recent trend in favor of ultra-light mice, and this thing feels nice and solid with the weights added. Finally, I really liked that the mouse is WIRED. Having run the gamut of wireless mice, I have found no matter what the claims are, they always are prone to connection glitches and, even when they work well for a time, are a PITA to always remember to keep charged. The new hero sensor is also awesome. Because of these desirable properties I lived in a state of denial about the mouses many glaring flaws for months. Sadly, I am out of denial and into grief. The main issue with this mouse is the scroll wheel. It just sucks. The mouse semi-regularly just decides the scroll wheel is being clicked, resulting in lots of odd behavior. And then its hard to know when youve successfully clicked the scroll wheel down, because it requires so much actuation force and yet has so little travel. The free-wheeling mode of the scroll wheel is reasonably nice, with a satisfying long spin, but its almost impossible not to occasionally click the button that puts it back into incremental scrolling mode. This is a big deal, because the incremental scrolling mode is unbelievably ghastly and thus something you would never use voluntarily The tactility feels all wrong--both too abrupt/tactile and not sticky enough for something that is so abrupt/tactile. At the same time, the scroll wheel actually rattles because of the force of the increments--but only like maybe half the time. The combination of these features induces an overall sensation of unpredictability and randomness along with an unpleasant sound. A less critical but still painful flaw is the button placement. The idea of a little ledge sticking out is to use a palm grip and rest your thumb there, right? One would think so. However, doing so places one of the other two main side buttons totally out of reach. You have bend your thumb back so hard to reach back button that it basically means only a claw grip is truly comfortable--in which case the thumb ledge goes unused. So, all in all, yeah I think Logitech should go back to the drawing board and generate this style of mouse with different button placement and a much more nicely tuned scroll wheel.