I have the now discontinued B4 from Native Instruments and it is simply incredible. Easily the most authentic sounding B3 .vst out there. From what I listened to, this sounds very similar. It seems like the only difference with the B4 was that it had many presets as far as drawbar settings, drive settings, percussion, etc. where as this package is actually 5 separate samples. This means that it will include everything that the B4 had plus 4 more sample libraries. No doubt a neat tool if you have the money.