Quadro seems way too hard to hit for how little damage it takes when hit. After flying it and fighting it, seems to me that if you move it just a little the pencils just miss it way too easily. The weapons don't seem to track it AT ALL the same way they do the other, regular winged planes for some reason. It's good for hanging out near a spot with health and some weapons, in particular, but I've always felt that people who do that are exhibiting very poor sportsmanship. I've been seeing that sort of behavior in the Loop and Lights Out lately with a few people who shall remain nameless. They fly in circles with a balsa from the pencils in some bricks in the Loop back to the center health, and do the same thing in a corner in Lights Out by the firecrackers and suction cups.
IDK, I'll keep watching, but more and more it seems to me that the quadro, although it has it's drawbacks, is just waaayyyy too hard to hit and/or damage and take down for it's huge benefits of holding a lot of weapons, hovering there above the weapons/health and taking them as they reappear. It's cool, but boring to fly, too, like the bomber. The only fun in it is knowing you can just move a little bit and incoming pencils, etc., won't track and hit you.