The tobacco has a caramel/toffee sorta taste to it with a pretty strong throat hit. It's good!
The RY4 is more of a hazelnut. It's also smoother and the taste lingers more. It's sorta coats your tongue. It also benefits GREATLY by being aged a few extra weeks.
They are both regulars in my arsenal of tobacco flavors.
I'm sure the next poster will completely disagree with me, though
I should also mention that the taste survives a glass a bourbon. Obviously, this numbs your tastebuds and throat, but the IKV flavors still come through...