Quintessence is a business that has received mixed reviews, but overall, customers have found the staff to be knowledgeable and helpful. The place is described as a nice and friendly environment, with a loyal customer base. While some customers have had disappointing experiences, the business is praised for providing life-saving vitamins, minerals, and other important nutrients, especially for those with medical conditions like terminal leukemia. The owner is described as a kind and compassionate individual.