A very nice sound, though if you look at the amount of controller info that is required to get that sound it is a lot of work... unless they also provide some controller patterns for specific sounds?
Other than that there are many, many synths and samplers. Emberton is just one.
What I would say is that what you described seemed to be more focused on doing songwriter demos to present to other artists, not to be the artist yourself. Therefore I would question the need, and the expense, of such accurate emulation of real instruments. Unless of course, there is a hidden artist in there screaming to get out?
I agree with comments about fingerprint sounds (as I mentioned them earlier too), it yet again comes down to what is important.
I tend towards creating finished tracks myself because I am happy being the artist, and if not they still make good demos to present to other artists. In other words I play the odds, knowing I am happy either way really.
I do know that I have heard quick demo versions of my own songs and hated them instantly, hearing only flaws and imperfections instead of something glorious.
In terms of Emberton again... it seems to have a decent expression engine for solo strings... have you checked it out for all the other food groups? Brass, woodwind, percussion, guitar & bass (electric and acoustic)... or are you essentially buying a solo violin synth?