Melissa, a reviewer, shares her experience with the Full Spectrum Cookies Cream Oil 600mg by Penguin. She initially expresses her intrigue in the product due to its cookies and cream flavor and high concentration of CBD. Melissa mentions that she has been taking the oil by placing a few drops under her tongue, despite being sensitive to tastes. She emphasizes that she has never experienced such a noticeable and immediate effect with any other CBD product. Melissa describes the sensation as a calming rush. Overall, her review highlights the effectiveness and ease of use of the Full Spectrum Cookies Cream Oil by Penguin.