So I bought the Logitech, basically because I was tired of the MM being unusable for casual gaming for its infamous scrollwheel issues. However this one feels weird to me. Can't even describe why, but I find difficult to position it with precision. But what's even worse is that it seems to hang often. While using Safari and scrolling the beachball has appeared several times while the mouse becomes unresponsive. Then it starts again. Would be glad if someone else could report its experience with this mouse. I'm using it together with Apple's wireless keyboard and my wireless network on. With the MM I have never had this issues.