Flavor is subjective, but clarity isn't. A good flavor is distinct, not muddled. When you taste a device, ask yourself: can I tell what it's supposed to be? Does it stay clean throughout the puff? Some devices start strong and then get harsh. Others taste like a mix of everything. For retail staff, the practical approach is to know your lineup's flavor profiles. The AURA and VERTEX-15K have strong reputations for clear flavor, but again, taste them yourself. Keep a small notebook with your impressions—it's a reference you'll actually use.