Looks pretty good! I hope the finish lasts for you.
I have the same mouse, except black and grey and I wouldn't consider painting it because of how much use it gets. I've had mine for less than 6 months now and the side where your thumb sits, as well as the left mouse button, have now been worn smooth and shiny. You can see exactly where my fingers usually sit.
The keyboard that I got with it also has smooth marks. The space bar and the spot below it both are worn smooth and shiny.