What's the difference between G9 and G9x?

the G9 supports up to 3200dpi.. Still a super nice mouse. Check out Best Buy. They have the G9 for 44.99
http://www.bestbuy.com/site/Logitech+-+G9+Laser+Gaming+Mouse/8472324.p?id=1185265538878&skuId=8472324&st=Over_50_off&cp=1&lp=1

I am still rocking the mx500 from 6 years ago

Overpriced.

I got my G9 for $35. Great mouse but for some reason it causes some discomfort with my ring finger. Just my grip I suppose. Don't fall for that picture grip crap. I was hoping they would come out with new grip shapes not just overpriced graphics.

I have this mouse. It has a bit of a weird shape that is uncomfortable. There are two cases for it (strange sounding I know) and one works better for me than the other, but still it feels weird. I liked Logitech's earlier mice better. This one works fine, just slightly uncomfortable for long FPS games.

i have g9 mouse. and i dont reget getting it..
endless features..
many great reviews..

Just ordered one after reading a bunch of reviews. I have a Razer Lachesis right now and I like it but I want a heavier mouse, the adjustable weights will be nice.

I have been using the G9 and can say it is great. I did however have to get used to it when I went from a G5 to it. The grip is significantly different for what reason I do not know.

My mouse history:
Generic Ball Mouse
Microsoft Intellimouse 3.0
Microsoft Explorer 3.0
Logitech MX 300
Logitech MX 510
Logitech MX 518
Logitech G5
Logitech G9

However now I see there is a newer G500... if you are used to the MX 500 - G5 then the G500 may be more up your alley than the G9x would be comfort wise.