As a stand alone I find Highbrow to be OK but put him up against the work of genius that is Animated Megatron (leader class) and Highbrow is less than OK. As mentioned earlier, Highbrow's propeller blades cannot spin without hitting each other, the same cannot be said of Animated Megatron due to their synchronicity. Furthermore, the guns of Highbrow have landing gear. So does Megatron's cannon and better yet the wheels move.

Even if Highbrow was made into a leader class figure it would still fall short of the high standard set by Animated Megatron which is how a twin blade attack copter should be.