The so called "engine drone" is in no way a fault. People have become used to the audio feedback of hearing their engine increase in RPM as they accelerate, but this transmission is smart enough to keep you in the optimal RPM for the specific operating condition, thus optimizing both fuel economy AND power. I believe people are just accustomed to hearing the engine change when they accelerate, and they perceive this as a lack of power, when it is in fact better than a regular transmission.