I used a steelseries Ikari and then G9x. The Ikari was very nice although it's more of a palm mouse. Other than being a little bit big and the laser being a bit erratic, I really liked it a lot. The mouse is super light, the buttons are extremely light, and I really liked the middle scroll as well. It isn't a weighted middle button like on logitech mice, but it's still really comfortable to use and very easy to click down, pretty good for 3ds max and other software where you pan around with middle click.
I'm using a g9x now though, it's shinier and I like the shape better since I have a claw grip.