I reckon that B4II is one of the best products that NI have ever released..
I still use it as my main organ sound and it's only x86 plugin - along with Wizooverb - that I use with a wrapper inside Win 7 x64...
Vintage Organs does not have the same "organic" sound (excuse the bad pun) that B4II has and like most people say,the distortion inside Kontakt is funking awful...
When you get B4 cranked up inside a track,it can easily replace an electric guitar because it's got a great vibe and real attitude