Very good. The Productivity Pack includes 5 doses perfect work perfectionists, students, office workers, or simply anyone looking in a either a detonation of thought power, or a long term refinement of learning control. A must have for students or workers, but also a good collection to have for anytime you need an IQ blast, seminary or workplace productivity, super intelligence, or general study and learning aid. If you have any desire to dominate in your school or workplace, this is a must-have collection.