RPM gives a smooth energy and focus for training sessions. Time just seems to fly by, regardless of how long it's been. I love this product. You will notice effects from the first dose.
Drive doesn't kick in for me until after 3 weeks, and the effects last for 5 weeks thereafter. You will NOT notice effects from Drive with the first dose, but it generally does not take a male as long as what it did me to notice/feel them (~10 days it should 'kick in').
However, together, RPM and Drive definitely aids in anyone looking for performance (i.e. my running improved). It also helps in trying to bring out muscle definition (if your diet is mostly right as well).