My G9 Teflon feet have seen roughly 40% use on a gloss particle board surface l since 09, not even half worn or even many scratches. What mouse do you use Brett?
And to What, mine doesn't jump across the screen on gloss, but it will make some jagged movement. The only true downside imo with a true laser mouse. Precision with a pad and low DPI can go pixel for pixel though. No optical is getting close.