It's more of a superfluous thing than a gimmick.
For pretty much anything you do gaming or otherwise, there's really never a reason to go out and get a $50+ mouse with buttons all over the place and DPI up the butt.
Look into the Logitech G400, or stuff similar to it.
-Fits into your hand nicely, provided you're right-handed.
-Has an M4/M5 button that can be bound for voice chat or other stuff in games, and moves back and forth between web pages.
-Little out-of-the-way DPI changing buttons which help when you wanna lazily change sensitivity outside of settings.
~$30