+1 I've spent a few hours now just going through Reaktor, Absynth, Massive and Battery - wow, the synth aspect is nice!
But I also like some of the additional Kontakt libraries that don't come with Kontakt itself, like Vintage Organ, four different piano libraries, the Scarbee bass, etc. Overall I'm finding it to be money well spent, at least for someone like myself who only owns Kontakt... and purchased recently enough to not have any additional libraries. There's enough in there to keep busy for a while!
Thanks again to Larry for this thread!