Con: It got buggy when I tried to delete a post that was install by the sample. It either timed out or gave me an internal sever issue (400). Which due to a strict time frame Im working on I didnt bother troubleshooting the issue so I uninstalled Ninjaboard.
So Im giving it 4 out of 5 because I feel even though from the demo its a wonderful forum but from an out of the box perspective it should run the same way... Smoothly!