I have gone through & tested quite a few wireless mice all which don't quite live up to what I want. I've tried the MX1000 and a few inbetween down to this Kensington one I have now. All seem jittery and when trying to do precise movements (like clicking color swatches or tools in Illustrator) it's not smooth like my Logitech USB mouse is at work on my PC. Both are optical and both are on the low-end of mice. Does the wire make that much of a difference?