If I were a director of InVision, with the well documented turmoil going on at vbulletin, and a tranche of new versions of stuff here, plus some brand new products, some good strong user documentation would be right near the TOP of my list of things to do,to make it (as far as possible) a 'no brainer' decision to both buy the product if I didn't have a board, and to transfer over to it, if I didn't.
I say that even though I have been very public in my discontent about the lack of support in general (not just documentation) for developers. I think a user manual would be a priority.