I have the 518 and it is a really good mouse, but from what hear the G5 is better. Also if what xelink said i true the G5 is cheaper than the 518 so that would be your better buy.
My friend has a copperhead, he really likes it b/c he has longer fingers. I don't like it b/c it doesn't conform to the had as much (it's for both right and leftys).
my dad has the g5 mouse and g15 keyboard combo they both work sweet as his performance in bf2 improved a heap when he got them ^_^ im getting them both soon once i get some cash lol
Ownage, that mouse looks sweet.. Might have to get it if I ever get Counter Strike or something, lol.
just bought the G% and a new keyboard, the mouse is just kick ass its wells good my acc on ET has improved by 5% and hs count ahs gone up loads!