I am at ubb6 beta 8 and although I think I have read every horror story there is here and at Infopop I have had very little problems I dont have a large board about 45 members But the only thing I lost was all my hacks which I prepared for I think alot of problems people are having actully came fro not fixing there profile fields before going from 5xx to 6.o There are still some bugs dont get me wong but I have had operating systems that didnt run this well...
No one is going to tell you to upgrade or nt thats your call..