All those people using my site to submit product uploads and reviews at the moment are vBulletin users. Perhaps the fundamental issue is that they are all familiar with the vBulletin editor and it's preview mode and such, and many know you can copy/paste into it and what is shown is pretty much what you see when you hit submit.
The ReviewPost editor doesn't work the same way, so it causes some frustration among users who are familiar with vBulletin or prefer to copy/paste from other websites or editors that are more familiar to them.
Of course, as the website admin, I want to make the experience as easy as possible for them to encourage them to submit content. Thus my frustration with the quirks in the editor, that seem to have been the main source of the issues I've had.
We're working around it as best we can, but hopefully that makes sense if you are looking for suggestions for future versions, especially if vB4 integration is a popular feature for others who use review post.
Don't mean to beat this dead horse any more, but perhaps that is why we have a different perspective on the issue since maybe you are used to entering content directly in one of the reviewpost editors whereas my community members may use different methods? Just a hunch.