So I got the XIM about a month ago. I sat around low diamond using the controller. This was my first time ever using a mouse and keyboard, so I was awful at first with it and dropped to 2600 SR, but i stuck with it cause I was so fed up with the controller aim mechanics in this game. I've been using linear, 12 curve (Xbox), 12.3 sensitivity, 12000 dpi. I got back from vacation last week at 2800 SR. In 5 days, I am now at 3450 SR and way more comfortable with the mouse and keyboard. I play tracer, 76, mccree, and Zarya; I've been demolishing people lately. Only thing that sucks is the max turn speed with tracer and quick flicks with mccree that I max out the turn speed and it throws my aim off a little bit. I've just focused on not swiping around my mouse as fast as I can and trying to stay below the max turn speed and it's way easier to control. I may try expo with the normal curve, but man this XIM is awesome.