Just an fyi,since you mention the ry4 double.The asian is nothing like the double,they are very far apart from each other as far as taste.I really like ry4 double,so i decided to try the asian and the regular ry4,the regular isn't too bad,but the asian in my opinion is horrble.The double is more of a sweet caramel and vanilla taste with a bit of tobacco,the regular is more tobacco forward with lighter tones of caramel and vanilla,and the asian tastes like some sort of nasty tobacco mixed with flowers haha.
I haven't tried it mixed with other flavors,so it could possibly be good that way,but as a stand alone flavor it was one of the worst flavors i have tried,where as the double is very good as a stand alone.