If you get the Razer Mamba, please tell me what you think of it in comparison. I couldn't imagine replacing my G5. I even had a problem with it not recognizing movement as well, and it's because the cord frayed, so I replaced the cord myself. Love the DPI adjustment buttons, great for sniping and photoshop.
I used the G5 for a very long time until the buttons stopped responding... to be fair it took a serious beating before dying.
IMO there isn't that much of a difference between the g5 and the mx518... I went from one to the other very quickly. At home where I actually do some gaming I use a g500... I like the custom weight adjustment, and really love hyper scroll - but it takes some getting used to.
Idk, I use both mice on a daily basis... personally I prefer the G500, and it was $35 with an instant rebate for me. Both are way beyond standard optical mice though... I spoiled myself with mechanical keyboards and good mice