My new favorite ECBP? Lets see Nose - This nose is just perfect bourbon. There's both nutty, caramel, vanilla, rich oak, and it's all so integrated that it just smells like rich dark sweet bourbon. OK it's a bit on the nutty side and a bit lacking in depth for the elite elite bourbons but still wow good. Taste - what really makes the 520 special is that neat it drinks so insanely well. C919 was insanely good but it was dry and astringent and needed about 3-6 drops of water to fix that and once it did well WOW. This doesn't need it at all. It's almost perfect neat. It's this sweet mellow oaked goodness giving us just a perfect baked pie and oaked smoked vanilla and hints of chocolate. There might be a roasted almond or walnut or something like that as well. yeah vanilla roasted almonds are here. But with water, things get even more dessert and creamy. There's still oak spice and the power of this one doesn't get questioned with a drop or 10. More water just leaves an oak and vanilla that was made for bourbon lovers. ECBP remains the quintessential definition of bourbon. It is what bourbon is supposed to be. You water this down to 90 proof and you get the age and perfect balance. You drink it neat and you get to enjoy the intense blow you away proof without it being off putting. B520 is perhaps the most "perfect" of these examples in that it simply has no flaws that aren't baked into the ECBP formula. If you like ECBP, this is great. if you've had some you didn't like, well this is the perfect balance. Bottom line a very RARE 4.0 for a sub 100 dollar bottle. I think I paid 140 for 2 bottles before tax. Money WELL spent.