Always wanted to ask. What makes a gaming mouse better than a standard one?

Always wanted to ask. What makes a gaming mouse better than a standard one?
The quality of the optical sensor and how precise it is mainly. Of course there's other factors too such as the size, weight, shape and feel etc.

Cool. I think a lot of them look better
I need to invest in a new mouse. I'm slowly becoming a PC gamer, will probably be something I'll look into soon!
They're just great mice with a nice low price tag. A lot of the stuff people are recommending here....... whilst good...... is very overpriced.
I'd get an mx518 thenThey're just great mice with a nice low price tag. A lot of the stuff people are recommending here....... whilst good...... is very overpriced.
I've got a G700 on my desktop pc (mx518 on the laptop). The g700 cost twice as much, and I can't really see why. It's marginally better than the mx518, but doesn't really warrant the rip-off pricetag.