Well, crap.
Have to say, I wasn't really that thrilled with that Blueberry Buckle thing with the BCC; the combo of cinnamon and blueberry doesn't hit me right or something; it tasted extremely metallic to me. So no great loss, other than the $1.15 or whatever I paid for it. But that annoys me about the Butter; that's the only Butter flavor BCV carries, and I don't think there is ANY other, which is diketone-free. Since that one is usually used in extremely minute quantities in the recipes I've seen, I might take a chance on it. Because otherwise I'll just have to sit on my hands and hope they make a V2 of it. Or TFA makes a DX.
Andria
Yeah, BCC as well as Cinnamon Coffee Cake for me works best used very lightly (equal to or under 1%) since the cinnamon in those is strongest. Never tried butter, but I imagine it'll be one I use ultra low if I ever am so inclined to use it.