When determining the quality of a perfume, it is important to consider several key factors. Firstly, the longevity of the scent is vital; a high-quality perfume should last all day without fading quickly. The complexity of the fragrance is another important aspect, with premium perfumes showcasing a well-balanced progression from top notes to base notes. These scents should blend together seamlessly without one note overpowering the others. Additionally, the sillage, or the trail left by the perfume, should be noticeable yet not overwhelming, creating a subtle aura around the wearer. Ultimately, a good quality perfume enhances the sensory experience with its depth and lasting impact.