Very yummy. If I was just reviewing the flavour, it'd be 5 stars. Tastes like pepsi on ice. Very sweet.
But, unfortunately, I had a bit of an issue with the mix quality at the end of the bottle. The last tank-full separated in the bottle so that it was a layer of pure koolada flavouring and high PG. The last tank-full was too harsh to vape!
Bear this in mind, you might want to stick to your own regime of shaking and steeping to see if that solves it.