So i finally found this sucker after holding on to a couple other batches until i could do a 3 batch comparison. I've read tons of reviews saying this is the batch to get. I'm comparing to A120 and B519. I loved B519 so really hoping that this is going to be THAT much better as all the reviews say it is. So here we go. I'm tasting all three of these while opening them all at the same time so oxidation won't be a factor and it's a fair comparison. First i opened the B519 since I'm familiar with it and it is the lowest proof at 122. Taste is as i remembered and again i really like this batch, wish i had a 3rd one hidden away. Next up is the B520 initial taste is not as impressive as i was hoping and B519 is ahead. Finally sip the A120 and at 136 proof it drinks as easy as the B519 but there's a bit of a "bite" to it. Initial taste from neck pours goes to 1) A120 2) B519 3)B520 so a bit of a surprise to me. A few weeks later and I came back to these and the order has changed 1)B520 2)B519 3)A120. The open bottle let the B520 turn into a completely different bourbon after about 2-1/2 weeks. It's now a smoother, sweeter, well rounded barrel proof EC like everyone says it is. I've never experienced such a change in a bottle in just a couple weeks. Wow. Regardless of how they rank in order I'm a happy camper with some ECBP in my cabinet. This was just the icing on the cake to have the B520 change profiles so quickly. Update 9/11/21 The longer this sits and the more I go back to it the better it gets. This is hands down the best ECBP that I’ve had. Soooo good! Update 1/16/22 The last of my B520 bottles keeps staring at me with puppy dog eyes begging to be opened but I will not give in to its temptation. I have so many bottles ahead of it to enjoy though I know none will be as good as it. 😞