It has been extensively discussed over at outlinersoftware.com:
Thank you: of course -- I never was considering it as an outliner
That forum isn't strictly about outliners, it really covers a lot more ground than one would guess from the name.
As with DC,
you also have some truly
experienced and intelligent users there.
They've been discussing outlining, mindmapping & pims at great length for years, and in great detail.
I found a pros/cons list on the Brain for you here
, written by a participant on this forum.
Considerations such as printing (!!!) are nothing to play around with, though.
Have you been to the Brain's web site? You might want to trial it.
I've watched them for quite a while & it seems that they're consistently working on improving their software.