I don't own this or the other earlier products from this line. I've always been intrigued as I am huge fan of 'algorithmic' stuff to help jump start ideas. I see the value in having all of this in one nice tidy package and it appears to be very well thought out and put together! Though there are alternatives out there if one likes the basic functionality/ideas behind this, but maybe not so interested in the included sound sources....
I'm not sure that the Sonuscore products are quite what you think...
While they have a similar end goal of helping you generate music, they are not actually what I would call generative music plugins in the same vein as RapidComposer or InstaComposer.
(Exception being the new Melody Studio in The Score which has a Markov melody generator that is presumably similar to the Markov melody generator in RapidComposer.)
Rather they effectively provide a series of handwritten presets (written for particular styles/moods) that can be played with various chords, combined and adapted.
I would say they are more similar to Sonokinetic's phrase-based libraries, though unlike Sonokinetic's libraries they work with MIDI data rather than being recorded phrases.
I think the main innovation with the Sonuscore products is that they use a special engine (called the Ensemble Engine in The Orchestra series and re-used in The Score) which provides some nice functionality for splitting out the chords you play among different instruments and adapts the MIDI based on your Mod Wheel.
Some people have described them as being glorified MIDI packs, which they kind of are, but MIDI packs that come with their own samples and automatically adapt to your chords and Mod Wheel.
I've seen several comments which seem to suggest that the Melody Studio has some sort of ability, like the Melody Studio, to generate chord progressions.
Unless I've missed something important, I don't think this is the case.
The Chord Studio is really just a Chord track (similar to what is build into Cubase) where you can arrange your chords rather than playing them in manually.
It does have the added convenience of being able to set the global dynamics, choose story presets (i.e. intro, A, B, Ending variations) and then send the chord progression you've programmed across to Melody Studio for it to use in generating your melody - that is the sole generative aspect of The Score, however.
One the whole, I'm really liking what I see of The Score (having just watched The Sampleist video), it looks nicely put together, has a nice range of presets and is really a step more towards what I've been looking for when compared to The Orchestra series.
Just a shame they've decided on this limited time crossgrade at such a high price, as it really feels like I'd be paying a premium price for an expansion to The Orchestra Complete 3.