Tribeca is a sure bet. Mild tobacco with some caramel and hints of vanilla, supposedely tipical RY4 stuff, though somewhat sweeter and rich than the others RY4 that i've tasted, which makes it a lot better IMHO. I get a lot more caramel than vanilla in it.
Now, this is Halo, so it has that "perfumey" or "powder" aftertaste. I like it, I think it adds something to the mix, but your mileage may vary. If you don't like that in Halo, you'll probably won't like this one either, though it is somewhat milder than in other flavours.
I vaped it straight out of the box, and it was fine. After 2 weeks the flavours haven't changed significantly.