Birst is being used as one of the primary business intelligence tools. We have been aggressive in our implementation for the last year, bringing on 3 different business units with the rest waiting on their turn to add data into Birst. Birst is an incredibly powerful tool when used correctly.
Training material online, having such a forward thinking company with such a backward approach to training material and documentation is a strange mix.
Not enough experienced people with technical implementation experience. When questions are asked to Birst people their typical answer is "Have you looked through the documentation?" Translation, I don't know the answer, and I don't know off hand anyone else that does either.