I've gone through two of these mice in the past 5 years, both failing with the dreaded "double click" failure on the left main button (you cant drag objects, cant click -drag-select. cant make a steady-line in a paint application without micro-breaks... its like the switch can't hold itself closed without being mashed). Logitech has replaced both without question; awesome support...love Logitech for that reason.
As for the mouse, its a rock star and despite the early switch failure on two units, I'll keep on buying this model until they retire it.
OH - and the splatter paint looks sort of greyish brown under areas where your hand touches it...but that's purely cosmetic.