As you would expect, most of the proof of the QLink's effectiveness is subjective. Because each person is unique, the benefits are unique to that individual.
Many people report that they are more focused and can concentrate over extended periods more easily.
Others report that they have energy and stamina throughout the day, especially at the end of the day when they used to feel irritable and fatigued. Others report that they are more emotionally balanced and less reactive to chaotic situations. Some report they experience a richer, more sensuous appreciation of life. Some report that they have no jet lag after flying across many time zones. Others that they sleep better.