I ordered the discovery set after reading the batch code guide, and the communication before dispatch was more useful than I expected. They confirmed the batch year, explained that the extrait concentration would sit closer to the skin in humid weather, and suggested I test it on my forearm rather than my wrist because of how often I wash my hands. The setup itself was straightforward: the samples arrived in labelled vials with a note on which ones needed maceration time. What impressed me most was the honesty about the weaker performers. They told me the citrus-forward one would fade within three hours on most skin types, and they were right. That kind of directness made me trust the rest of their recommendations.