well, I can tell you this.....
if MBV doesn't post test results on the website, and they won't email you test results...........then they probably have diketones, acetoin, etc in them.
MBV has been claiming for ~7 months that they're testing their e-liquids, continually assuring customers that their flavoring supplier claims they're diketone-free.
While I used to think of them as a transparent company, this seems a bit shady. Wouldn't be surprised if some of the flavors in their line contain detectable levels of diketones. It'd result in a lawsuit, considering they've been guaranteeing diacetyl-free juice since their inception.