Greetings! I've been away from the vBulletin community for some years and upon returning to see if vB4/5 had yet matured into a stable product capable of running a very large (5MM post, 3000 concurrent user) site, I've found feedback that suggests that vB5 may not be the way to go. Are there any communities that have ventured down this path before that could provide some insights into what some of the drawbacks/benefits of either direction might be? Realizing, of course, that this site is interested in XF, I'd appreciate any data or metrics that might help with drawing a conclusion and I appreciate in advance your fact-based responses. I'm well aware that there is a generally negative feeling surrounding the company developing vBulletin today, however I'm interested only in a fact based comparison of vB5 vs. XF in terms of performance for the forum and blog modules only of vB3. Thanks!