I have the original G700 since it came out.
Actually I hold the mouse the way that my thumb and pinky are sliding on the sides of the mouse on the mousepad. This gives me better control and relaxes my hand in longer sessions.
My mousepad is not that uncomfortable so I don't mind. Also I have the G700 set at 2750 dpi, so I don't move around that much.
edit: I also noted now that I tighten the grip with the thumb and pinky to lift up the mouse slighty to reduce the gliding speed for more precision.
My mouse handling is quiet odd, the more I think about it.