Here's a review of three RY4 e-liquids from Janty, the company that created the original RY4. These juices mostly stick to the "classic" RY4 format of being bright and balanced, rather than the "modern" RY4 taste that many people know --heavy on the caramel and vanilla. I was particularly enamored with DK RY4 and Classic RY4, with the latter being my gold standard for synthetic RY4 juices. Full review and steeping notes here.