MX Revolution

Yesterday, I bought the MX Revolution mouse, because my old MX500 was dying. Anyway, Im having troubles in adjusting to it. Mayby its just a matter of time before I get used to it, but for now my acuracy in Illustrator is way off. I’m kinda worried that I’ll have to return it, or resell it.
Does anyone else had similar problems when switching to MXrev, MX1000, or any other ‘bigger’ mouse?