My favourite, RY4D. Love it with extra caramel, sometimes licorice, jamaican rum, bit of marshmallow too. For me i get flavour fade with it bad though even at 10%. Flavour fades in just 2 days. At 15% is where its good for me. I cant taste it at all much below 10%. Gotta let it steep though cos what you taste in the first couple or few weeks isnt what it should be. 4 its getting there but 6 its arrived. Mix a couple at various levels and see which suits.