I don't know anything about the KK Neo presets, but when I was watching loopops walkthrough a while ago it was clear that the PCM samples are there, and they're actually quite good, and creating electric pianos, clavinets, mellotrons, dx electric pianos, etc. with credibility for working well in a band context, is easy. Piano, a bit limited to create some more advanced things for obvious reasons.
So in the context of the op of his thread, I definitely think it could be something to investigate. My KK (original black one) is a total keeper, it's my bread and butter for everything "Vintage Synth" when required. For the rest (PCM) I have my Kurzweil PC3.