I do better at Stargate than Defender points-wise, but that's because I always play the two-credit game with double the lives -- lame I know, but hey it's a freakin' hard game.
I built a desktop controller with button placement specific for Defender and baby, that's the only way to play the game. I am trying to figure out how to work in Defender-specific controls on my cab too. Without exactly the correct buttons, Defender and Stargate are even harder, IMO. Gotta have the controls correct...
Eric.