I had an optical "Genius" mouse, worked hard for a good 6 years and now the scroll is giving me s***.
Whatever let's just get something else that lasts another 6 years, yeah?
Now, what do I want?
-Rechargeable battery. None of that AA crap, rechargeable or not.
-Rechargeable (and usable while being recharged) by USB connection.
-Extra side buttons, scroll, good dpi, nice grip, durable materials/paint, all that good stuff you expect from the average mouse that you expect to use for graphics design for years to come.