Just wanted to preface this by saying that I've used Logitech mice for most of my life, starting with a couple of MX510's and MX518's. I was pleased to hear that they had re-launched the MX518 and ordered it as soon as they found out about it. I was very disappointed to say the least when I actually started using it. It had a familiar grip and weight, but the sensor is just awful. I can barely lift the mouse off the mat to keep the cursor from crashing. My 12 year old MX510 is still much more accurate than this one. It feels like they've repackaged a junk mouse in name only as the MX518. upset.