Allegreo alquanto:
Piano sounds pretty good, if a bit undynamic and mechanical in places. (1:40 e.g.).
Strings are lacking stereo field, I think this is mainly a reverb issue - the reverb is very bad and 1-dimensional, so it doesn't spread out the material in the stereo field very well.
Strings also lack some EQ, especially violins sound pretty harsh in places. And they lack air. Violas generally sound weird but that one I will attribute to the sound of Sychron.
Sarabande grave:
Timpani sounds like it was recorded in a bed room, lacking any sense of space and scope. Generally all string lines sound very mechanical.
The solo violin sounds like it was recorded 300 meters away from the rest of the orchestra, lacking any air and frankly sounds horrible - hardly qualifying for sounding like a solo string. Needs to be placed and EQ'ed totally different, but that probably won't save the sound and bad legato that seems inherint to it (note, I don't own the solo strings so I can't really comment on how they COULD sound), but who knows.
Piano sounds pretty good again.
The little percussion there is also sounds (like timpani) too close and without any sense of space.
Violins at 3:30 onwards... wow.... sounds very mechanical, MIDI-like with no expression or feel whatsoever. This can be said about most of the legato strings actually.
Again violas sound metallic, mono-like and strange. Sounds like something out of a 1980's GM-synth. To some degree the same goes for cellos mostly.
Finale allegro:
Percussion again needs to be placed further away, snare drums sound like they are right next to you. Cellos and basses in the beginning sound decent enough, but violas coming in and violins playing without any expression or musicality in them again ruins it. They are also just abrubtly cut off in many places before proceeding to the next phrase.
Again the solo violin sounds almost like a joke. Is it a violin morphed with a soprano singer and a theremin or what?
Basically the same criticism as with the two first pieces apply: Lots of shortcomings in mix + MIDI execution.
Piano is the positive highlight again. Strings are a low. I certainly think they can be bettered with the right craftmanship and knowledge about how to get the best out of samples applied to them, but I also think they show their inherent shortcomings.