I just received a free Logitech Performance MX mouse in the mail because my MX Revolution had connection and battery life issues, so they gave me the newer model. There's a bunch of things I don't like about this new improvement, but what choice do I have. I'm having this issue that i'm not sure if it's a problem or me being too picky, but when i slowly move the mouse across the desktop, it seems to skip randomly and move slightly up or down along the path i have it moving on. Could this be due to the Darkfield tracking system? I have also noticed that no matter how hard I try, I can't get it to move in a straight line parallel to my desktop, it lazily goes up when i move it to the right.