vB4 was somewhere around 100x better on it's initial release than vB5 is now after 7 months (to the day) of vB5 being released.
vB4 could (and was) used by sites in the beginning. The biggest issue with vB5 is that it can't (for technical reasons) realistically run on anything but the smallest sites with little or no traffic. It's a resource hog to the point of absurdum. vBulletin 5 uptake has been stuck at 0.5% of their install base since we started tracking it over here:
https://tools.digitalpoint.com/cookie-search
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So let's compare...
In 7 months, 0.5% of vBulletin's customer base have upgraded to their latest version.
In 10 months, 79.2% of Invision's customer base have upgraded to their latest version.
In less than 2 months, 58.7% of XenForo's customer base have upgraded to their latest version.
It's actually pretty sad, because vBulletin was really, really great at one point not too long ago. And now they more or less have no long-term future.
While this chart doesn't look like much, it shows vBulletin has lost 2.6% of the entire commercial forum marketshare in a matter of 7 weeks. Not even Nokia or Blackberry ever lost marketshare at that remotely that high of a rate (19.3% per year).
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