My mouse has two wheels, I win. LOL The other wheel is for side scrolling. It also supports gestures, I never use either feature or the extra buttons. It does have three things I love.
1) It's big, you know what they say about guys with big hands... they have a big mouse.
2) Freewheel scroll wheel, if you have never tried one of these you will never go back to indexed wheel. You can switch between freewheel and indexed.
3) It can connect to up three devices independently, keyword is independently. There is button on the bottom to switch between devices.
“Results! Why, man, I have gotten a lot of results! I have found several thousand things that won’t work.”
Attributed - Thomas Edison