Like Zetsumei says...
Athena, I know you've probably read countless reviews, but here is another one with some good info and pics (of what actually comes in the package..grips/casings/etc).http://www.extremetech.com/article2/0,1697,2177894,00.asp
... I dont know i fyou're a finger mouse user or a palm user.
the g9 comes with 2 outer casings for both users. I liked the feel of it, and would definately get it if i had to get a new mouse (i actually need one i broke my scroll of my g5 i'm just to cheap). but the ergonomics are great from what i've seen. Its just another generation up....
Athena, I know you've probably read countless reviews, but here is another one with some good info and pics (of what actually comes in the package..grips/casings/etc).http://www.extremetech.com/article2/0,1697,2177894,00.asp