I don’t have the hard experience with it at scale that you’re looking for, but it’s so slow and unstable even with small data I don’t see how this could be used with Big Data at scale unless you want to pump a ton of money into paying for custom support.
Multi-user production use with logins and enterprise grade security? You saw the zero day that just happened this week right? I don’t think you’d want to use it for that unless it’s just doing viz of publicly available data (which is my use case but I am on the verge of giving up on it even for that).
I think it’s mostly good for making little tutorial posts and proof of concept examples for those who can’t be bothered to learn HTML, CSS and JS… I sound bitter right? Don’t go by me…