SB, I don't think they claim that it's an updated rotary sim they just claim "extra thick Rotary Speaker effects".. the rotary speaker effect is hardcoded into the Kronos OS, so they're not going to be able to update that! They might be able to make it sound thicker based on EQ'ing it slightly, or give it more stereo animation using other Kronos effects, but it's not an updated leslie sim.
I've listed to these demos before and I'm not particularly impressed. Some of the sounds are OK but some of them, like the Rock Organs are laughable (just my opinon). I would definately NOT pay $40 for these sounds.
I agree...K-Sounds has a lot of decent products, but your don't need Organimation for the Kronos.