I have been using vBulletin 4 for a long time, but now i decided that's the right time to change it. My pain is caused by many security bugs which vBulletin have. I'm not sure which discussion board engine I will choose, but XenForo looks like a solid and modern system.
My question is, how is it going XenForo and Security? Is it secure enough?
Another question, is there any discounts for "old" vbulletin users? Xenforo should encourage them, to upgrade their forums to XenForo ...