The argument I've heard is that a quad copter is like flying one of those magic arm machines that you grab toys with. A coax heli is like trying to balance a ball in a bowl - it'll stay there largely of its own accord. A fixed-pitch is like trying to balance a ball on the back of a bowl - you're fine until you get a little out of kilter, then you better correct in a hurry. A collective pitch is like trying to balance a pool cue on the back of a bowl. I know this - quads are boring as fuck. I should probably pick one up because they teach you perspective. Coax are easy. They're fun to launch and land. I gave away three IR coax helis and bought a Blade mSR. I embarrass myself regularly. It's a bitch to fly. It's to the point where I'm thinking of installing a simulator so that my crashes are less expensive.