I have the G15 with the one column of G keys on the left. I've never really used any of the actual Logitech macro functionality but those 6 extra keys make all the difference for me when boxing. I'm not sure Id use any more than that though. That's why I'm holding off on the new G510. It looks pretty nice and it's getting good reviews so, maybe check that out if you don't mind the size and want some extra buttons.