May I ask why you think it's a bad thing that competition is discussed on either communities? I found out about XF because someone mentioned it at vB. It provided me with valuable information. This stimulates competition even more as customers are more aware of all available solutions and their positives and negatives. In the end the products get better and customers make better informed decisions.Don't get me wrong. I'd like to see XF continue. But wouldn't vB be the place to post comments by vB owners? And XF's future doesn't depend on vB5.
Whether vB5 is a dog or success, XF's future is going to be played out in court.
Believe me, a high quality vbulletin product vs low quality will make a huge difference. vB has a huge customer base, most customers already here did not come out of thin air. Many used to be vb customers.