Has anyone else done a side-by-side of different bottling dates (presumably different batches) of BCBS '12? I've been drinking the 09/06/12 date for the past couple of weeks, including a bottle last night. It's sublime: very forward vanilla character and general sweetness with mild heat. We were jokingly referring to this as the "Pappy bottling date." Tonight, I'm having an 09/17/12 date. The vanilla is less forward; it's more tannic and caramelly, with slightly more heat than the 09/06 date. They're still fundamentally BCBS, but they don't taste the same to me. Has anyone else encountered this difference? Are there other bottling dates with further differences? This is not a complaint thread, so please don't suggest that I should e-mail the brewery. I am just looking for other experiences.