What was the reason for this?
Is it really that far behind vB?
I've been thinking and thinking for a long time now to go for a change over from vB to Xenforo but just can't do it, my Forum is so highly customised, with VBSEO and a whole load of mods installed.
Maybe one day I will.
On another note, I guess a think that Xenforo could do is offer a free migration service from vB to Xenforo then sit back and watch 100s of 1000s of Forums buy this software...